1

grown-up

adjective \ ˈgrōn-ˌəp \

Definition of grown-up

1 : not childish or immature : adult
2 : of, for, or characteristic of adults
  • insisted on wearing grown-up clothes

First Known Use of grown-up

1633

in the meaning defined at sense 1

See Words from the same year
NEW! Time Traveler

grown-up Synonyms

Synonyms

adult, mature;

Antonyms

adolescent, immature;

Near Antonyms

childish, infantile, kiddish;


2

grown-up

noun

Definition of grown-up

: adult

First Known Use of grown-up

1813

in the meaning defined above

See Words from the same year
NEW! Time Traveler

GROWN-UP Defined for English Language Learners

grown-up

Definition of grown-up for English Language Learners

  • : no longer young : fully grown

  • : suitable for adults

  • : like an adult


grown-up

Definition of grown-up for English Language Learners

  • : a person who is fully grown


GROWN-UP Defined for Kids

1

grown-up

adjective \ ˈgrōn-ˌəp \

Definition of grown-up for Students

: 1adult

2

grown-up

noun

Definition of grown-up for Students

: an adult person


Seen and Heard

What made you want to look up grown-up? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

having an air of easy unconcern

Get Word of the Day daily email!

Test Your Vocabulary

The Eponym Quiz

  • rubens-painting
  • Which is the best synonym of bowdlerize?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!