Adonis pyrenaica has an erect and a little pubescent stem, forming thick tufts measuring approximately. Leaves of this plant are alternate, the lower ones have a long petiole. The plant produces inflorescences showing from one to three yellow flowers, with petals of about. The yellow sepals may be glabrous or slightly hairy. Corolla can reach a width of and it is composed of10 to 15 obovate petals. Stamens have yellow anthers. The fruits are in the form of achenes of 6–7 mm, from glabrous to densely pubescent.