grown-up

adjective
\ ˈgrōn-ˌəp \

Definition of grown-up

 (Entry 1 of 2)

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

grown-up

noun

Definition of grown-up (Entry 2 of 2)

: adult

Synonyms & Antonyms for grown-up

Synonyms: Adjective

adult, mature

Synonyms: Noun

adult

Antonyms: Adjective

adolescent, immature

Visit the Thesaurus for More 

First Known Use of grown-up

Adjective

1633, in the meaning defined at sense 1

Noun

1813, in the meaning defined above

Keep scrolling for more

Learn More about grown-up

Dictionary Entries near grown-up

growling

growly

grown

grown-up

grown-upness

grow on

grow on trees

Statistics for grown-up

Look-up Popularity

Time Traveler for grown-up

The first known use of grown-up was in 1633

See more words from the same year

Keep scrolling for more

More Definitions for grown-up

grown-up

adjective

English Language Learners Definition of grown-up

 (Entry 1 of 2)

: no longer young : fully grown
: suitable for adults
: like an adult

grown-up

noun

English Language Learners Definition of grown-up (Entry 2 of 2)

somewhat informal : a person who is fully grown

grown-up

adjective
\ ˈgrōn-ˌəp\

Kids Definition of grown-up

 (Entry 1 of 2)

grown-up

noun

Kids Definition of grown-up (Entry 2 of 2)

: an adult person

Keep scrolling for more

More from Merriam-Webster on grown-up

Rhyming Dictionary: Words that rhyme with grown-up

Thesaurus: All synonyms and antonyms for grown-up

Spanish Central: Translation of grown-up

Nglish: Translation of grown-up for Spanish Speakers

Britannica English: Translation of grown-up for Arabic Speakers

Comments on grown-up

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

WORD OF THE DAY

the perfect form or example of something

Get Word of the Day daily email!

Test Your Vocabulary

What did you just call me?! A Quiz

  • rows-of-various-emoji
  • If a member of the audience describes your speech as bombastic, does that person mean it is:
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Add Diction

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!