Adjectival noun (Japanese)

In descriptions of the Japanese language, an adjectival noun, nominal adjective, copular noun, adjectival verb, quasi-adjective, pseudo-adjective, or na-adjective, is a noun that can function as an adjective by taking the particle 〜な -na. Adjectival nouns constitute one of several Japanese word classes that can be considered equivalent to adjectives.
In their attributive function, Japanese adjectival nouns function similarly to English noun adjuncts, as in "chicken soup" or "winter coat" – in these cases, the nouns "chicken" and "winter" modify the nouns "soup" and "coat", respectively. Japanese adjectival nouns can also be used predicatively – in that use, they do not take the -na suffix, but normally combine with forms of the copular verb.

Terminology

The current term for the so-called "adjectival nouns" is. Here, refers to the semantic aspect of these words as qualifying the state or condition of a noun; and, etymologically and historically, refers to conjugative words in general, conjugative words with ichidan, nidan, yodan, godan and irregular conjugation, or conjugative words that semantically convey action. Historically, this term was used tentatively by some grammarians, such as, for words that are now called Ōtsuki Fumihiko, while still following the mainstream terminology in his own grammar, expressed his opinion that Japanese "adjectives," due to their affinity with "verbs," are not at all like adjectives in English, Latin, French, German, etc., and suggested keiyō dōshi as an alternative term like Matsushita. The "attributive adjective" sense was applied in a different way by yet other grammarians, such as Hamada Kenjirō and, who used keiyō dōshi for "verb" forms that occur attributively, such as as in. The first use of keiyō dōshi for so-called "na-adjectives" is attributed to. In this case, keiyō has the same "qualifying" meaning as in keiyōshi, while dōshi is specifically for the irregular conjugation of the auxiliary copula, which, when fused with the particles and, results in and, both of which correspond to the modern ; in other words, keiyō dōshi means "qualifying conjugative words with irregular conjugation." Haga also included the ending resulting from a fusion of the form of keiyōshi.
The Japanese term is not necessarily at odds with the English term adjectival noun, since in traditional Japanese grammar, keiyō dōshi includes the copula, while the adjectival noun in the analysis described here does not include the copula. For example, in the traditional grammar, kirei da is a keiyō dōshi and kirei is its stem; in the analysis here, kirei is an adjectival noun and kirei da is its combination with the copula. Considering the copula is a kind of verb and kirei is a kind of noun syntactically, both terminologies make sense.
Grammatically, these words are similar to nouns, or more technically, nominals, which function attributively. The main differences between these and regular nouns are that nouns take a 〜の -no suffix when acting attributively, while these words take a 〜な -na suffix when acting attributively; most of these words cannot be used as the agent or patient of a sentence; and most of these words cannot be modified by relative clauses. Aside from these differences, Japanese adjectival nouns and regular nouns behave the same way in terms of grammar. They are variously referred to as "adjectival verbs", "adjectival nouns", "na adjectives", and "na nominals". For example, Eleanor Harz Jorden refers to them as "na-nominals" in her textbook Japanese: The Spoken Language.
In fact, by some analyses, nouns and na-nominals are fundamentally grammatically the same, where 〜の vs. 〜な when used attributively is simply a conventional stylistic complementary distribution, with 〜の／〜な being allomorphs. This view is reinforced by the fact that some words, such as 特別 tokubetsu "special", can take either a 〜の or a 〜な, depending on the phrase. Ultimately, 〜な is an abbreviation of 〜にある, used to use a noun attributively, while 〜の is the genitive case; see etymology, below.

Characterization

In traditional Japanese grammar, adjectival nouns are considered "inflectional", katsuyō, like verbs and i-adjectives, rather than non-inflectional hikatsuyōgo or mukatsuyōgo, like nouns.
This is a point of disagreement in current Japanese grammar, and authors such as Uehara argue that instead, adjectival nouns should be classed with nouns as non-inflectional.
The claim that na-adjectives are inflectional rests on the claim that the syllable da 'is', usually regarded as a "copula verb", is really a suffix – an inflection. Thus, hon 'book', generates a one-word sentence, honda 'it is a book', not a two-word sentence, hon da. However, numerous constructions seem to be incompatible with the suffixal copula claim.

Reduplication for emphasis
:Hora! Hon, hon! 'See, it is a book!'
:Hora! Kirei, kirei! 'See, it is pretty!'
:Hora! Furui, furui! 'See, it is old!'
:Hora! Iku, iku! 'See, it does go!'
Questions. In Japanese, questions are formed by adding the particle ka.
:Hon/kirei ka? 'Is it a book?; Is it pretty?'
:Furu-i/Ik-u ka? 'Is it old?; Does it go?'
Several auxiliary verbs, e.g., mitai, 'looks like it's'
:Hon mitai da; Kirei mitai da 'It seems to be a book; It seems to be pretty'
:Furu-i mitai da; Ik-u mitai da 'It seems to be old; It seems to go'

On the basis of such constructions, Uehara finds that the copula is indeed an independent word, and that regarding the parameters on which i-adjectives share the syntactic pattern of verbs, the nominal adjectives pattern with pure nouns instead.

''taru'' adjectives

In Late Old Japanese, a separate kind of tari adjectival nouns developed alongside the existing nari ones. The nari ones developed into the adjectival nouns that are the subject of this article, while the tari ones mostly died out over the course of Late Middle Japanese, being mostly gone by Early Modern Japanese, surviving as fossils in a few words which are generally considered somewhat stiff or archaic. These are generally referred to as ト・タル形容動詞 or タルト型活用, and can also function adverbially with 〜と -to, instead of the 〜に -ni which is mostly used with な nominals. See taru adjectives for further discussion in English, and 形容動詞#タルト型活用 for Japanese.

''naru'' adjectives

A few nari adjectival nouns followed a similar path to tari adjectival nouns, becoming naru adjectives in Modern Japanese, rather than na adjectives as most nari adjectival nouns did. These include 単なる tannaru "mere, simple" or 聖なる seinaru "holy" and are generally classed as ''rentaishi.''

Historical Forms

Old Japanese

Old Japanese has one type of adjectival noun with the following inflections.

Irrealis 未然形	Adverbial 連用形	Conclusive 終止形	Attributive 連体形	Realis 已然形	Imperative 命令形
-nara	-nari	-nari	-naru	-nare	-nare

[|Late Old Japanese]

Late Old Japanese has two types of adjectival nouns: nar- and tar-.

Type	Irrealis 未然形	Adverbial 連用形	Conclusive 終止形	Attributive 連体形	Realis 已然形	Imperative 命令形
Nar-	-nara	-nari -ni	-nari	-naru	-nare	-nare
Tar-	-tara	-tari -to	-tari	-taru	-tare	-tare

The newly developed tar- inflections are used in kanbun kundoku.

Early Middle Japanese

Early Middle Japanese has two types of adjectival nouns: na- and tar-.

Type	Irrealis 未然形	Adverbial 連用形	Conclusive 終止形	Attributive 連体形	Realis 已然形	Imperative 命令形
Na-	-nara	-nari -ni	-nari	-naru -na	-nare
Tar-		-to	-tari	-taru

Late Middle Japanese

Late Middle Japanese has two types of adjectival nouns: na and t-.

Type	Irrealis 未然形	Adverbial 連用形	Conclusive 終止形	Attributive 連体形	Realis 已然形	Imperative 命令形
N-	-nara	-ni -de	-dya -na	-naru -na no	-nare
T-		-to		-taru

Early Modern Japanese (Kamigata)

The early half of Early Modern Japanese as exhibited in the Kamigata region has a single type of adjectival noun with the following inflections.

Irrealis 未然形	Adverbial 連用形	Conclusive 終止形	Attributive 連体形	Realis 已然形	Imperative 命令形
	-ni -de	-na	-na	-nare

The deteriorating tar- type is lost.

Early Modern Japanese (Edo)

The later half of Early Modern Japanese as found in Edo has a single type of adjectival noun with the following inflections. These forms are identical to the modern forms.

Irrealis 未然形	Adverbial 連用形	Conclusive 終止形	Attributive 連体形	Hypothetical 仮定形	Imperative 命令形
-daro	-daQ -de -ni	-da	-na	-nara

Modern Japanese

There is one type of adjectival noun in modern usage, with inflections as follows.

Irrealis 未然形	Adverbial 連用形	Conclusive 終止形	Attributive 連体形	Hypothetical 仮定形	Imperative 命令形
-daro	-daQ -de -ni	-da	-na	-nara

The modern inflections are based on two primitive forms: d- and n-. The n- forms are historically older while the d- forms are newer and have replaced some of the older n- forms.
Irrealis -daro is found with particle -u, resulting in -darou. Historically it was -dara. /au/ regularly changed into .
Adverbial -daQ is often found with past particle -ta, resulting in "daQta" -> "datta".
Adverbial -de is found before "aru" and "nai", as well as being used in to terminate one clause before beginning another.
Adverbial -ni is used in adverbial constructions.
Modern Japanese no longer inflects for imperative.

Etymology

Japanese adjectival nouns differ in etymological origin from adjectival verbs. Whereas adjectival verbs are almost entirely native in origin, the class of adjectival nouns comprises mostly foreign loanwords and a small subset of polymorphemic native words. All words listed in this section take the attributive -na and predicative -da copula.

Loanwords

Most adjectival nouns are of primarily Chinese origin, but there is a not-insignificant quantity of adjectival noun loanwords from other languages as well
Chinese Origin

Word	Romanization	Gloss
豊富	hōfu	bounty, ampleness / bounteous, ample
元気	genki	spirit, liveliness / energetic, lively
安全	anzen	safe / safety

English Origin

Word	Romanization	Gloss
リアル	riaru	real world/real
モダン	modan	modernity / modern
スリリング	suriringu	thrill / thrilling

French Origin

Word	Romanization	Gloss	Gloss
アバンギャルド	abangyarudo	avant-garde	avant-garde
シュール	shuuru	surréalistique	surreal / surrealism
シック	shikku	chic	chic / in vogue

Native Words

In addition to loanwords, within the class of adjectival nouns also exists a small subset of native Japanese words. These words are argued to be polymorphemic in nature, with the latter,, being a suffix that creates an adjectival noun. Nishiyama asserts that this helps to distinguish native adjectival nouns from native adjectival verbs.
Native Adjectival Nouns

Word	Romanization	Gloss
静-か	shizu-ka	silent; quiet
爽-やか	sawa-yaka	fresh
明-らか	aki-raka	obvious; clear; plain

Copula ''-na/-da''

All forms of the copula can be considered to derive from two infinitive forms, ni and to. Because the copula lacked any other forms, secondary conjugations with the verb ari were used. The original ni ari and to ari contracted to form nari and tari. To derive the modern forms na and da, changes such as the following have been proposed.
For attributive na :

ni aru > naru > na

For predicative da :

ni te ari > de ari > de a > da

In some regions, these changes progressed differently, resulting in forms such as ja or ya
The infinitive form ni is still in widespread use, but the form to has become a much rarer alternative for use with adjectives.

Internal properties

The internal properties of Japanese adjectival nouns can be analysed either through a lexical features approach or through a Distributed Morphology approach.

Chomsky's lexical properties

Miyagawa argues that Japanese adjectival nouns can be classified using Noam Chomsky's lexical feature system. He proposed the following analysis for Japanese lexical categories:
Japanese Lexical Categories

Lexical Category	Lexical Features
Verb
Noun
Verbal Noun
Adjectival Verb
Adjectival Noun
Postposition

Under this system, Japanese adjectival nouns are classed similarly to English pure adjectives . However, because Japanese also has adjectival verbs with the lexical property, it is observed that Japanese adjectival nouns and English pure adjectives are distinct.

Morphological tree structure

The internal morphological structure of Japanese adjectival phrases can be represented by the following trees:

Adjectival Noun	Adjectival Verb	Noun

Within the tree structures, the word root combines with the functional category n0 to become a noun, then combine with the functional head a0 to form an adjective. Both nouns and adjectives contain the root-n0 combination, and it is the presence of a0 that results in the appearance of the attributive copula -na.