The bicolored conebill is 11.4 cm long and weighs 11 g. The adult is grey-blue above and buff-tinged grey below, with red eyes, pink legs and a sharp, pointed bill. The primary flight feathers are bluish with brown edgings. The sexes are similar, although the female may be a little duller, but immature birds are greenish above and have pale yellowunderparts. Birds sometimes breed in immature plumage.