Antonyms for grownup
ˈgroʊnˌʌpgrownup

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1. adult, grownupadjective

   a fully developed person from maturity onward

   Antonyms:
   immature

   Synonyms:
   adult

2. adult, big, full-grown, fully grown, grown, grownupadjective

   (of animals) fully developed

   "an adult animal"; "a grown woman"

   Antonyms:
   immature

   Synonyms:
   bountiful, magnanimous, full-grown, prominent, big, vainglorious, cock-a-hoop, braggy, heavy(p), giving, grown, large(p), enceinte, bounteous, liberal, self-aggrandizing, swelled, handsome, fully grown, braggart(a), with child(p), bighearted, expectant, heavy(a), great(p), large, bragging(a), bad, freehanded, pornographic, big(a), self-aggrandising, boastful, openhanded, adult, gravid, big(p), crowing

How to use grownup in a sentence?

1. Tom Rath:

   The argument is you need a responsible grownup, but a large part of the world doesn't want a responsible grownup, i don't think it's enough to say I know all the stuff he doesn't or he's rash, because right now people aren't filtering that through.

2. Paxton Blair:

   A grownup is a child with layers on.

3. Mary Carskadon:

   All those things, show me a grownup who is able to do that, it's putting a big burden on teens without much support to help them implement those changes.

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