Found 2 items, similar to grownup.
English → English (WordNet) Definition: grownup grownup adj : (of animals) fully developed; “an adult animal”; “a grown woman” [syn: adult, big, full-grown, fully grown, grown] n : a fully developed person from maturity onward [syn: adult] [ant: juvenile]
English → English (gcide) Definition: grownup grownup \grownup\ adj. fully developed; adult; mature; -- of people and animals; as, Act like a grownup!. Syn: adult, big, full-grown, fully grown, grown. [WordNet 1.5]