Grown-up Definition

grōnŭp
grownup, grownups, grown-ups
adjective
That is an adult.
Webster's New World
Of, for, or like an adult.
Webster's New World
Having or showing maturity in outlook, attitude, or appearance.
A grown-up attitude toward work.
American Heritage
Antonyms:
noun

An adult.

Wiktionary
Synonyms:
  • grown person
  • grown woman
  • grown man
  • adult
Antonyms:
verb
Past participle of grow up.
Wiktionary

Other Word Forms of Grown-up

Noun

Singular:
grown-up
Plural:
grown-ups

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grown-up