grownup

from WordNet (r) 3.0 (2006)

grownup
    adj 1: (of animals) fully developed; "an adult animal"; "a grown
           woman" [syn: {adult}, {big}, {full-grown}, {fully grown},
           {grown}, {grownup}]
    n 1: a fully developed person from maturity onward [syn:
         {adult}, {grownup}] [ant: {juvenile}, {juvenile person}]

from The Collaborative International Dictionary of English v.0.48

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]

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