grown-up
1 of 2adjective
ˈgrōn-ˌəp 
1
: not childish or immature : adult
2
: of, for, or characteristic of adults
insisted on wearing grown-up clothes
grown-up
2 of 2noun
: adult
Synonyms
Adjective
- adult
- mature
Noun
- adult
See all Synonyms & Antonyms 
Word History
First Known Use
Adjective
1633, in the meaning defined at sense 1
Noun
1813, in the meaning defined above
Kids Definition
grown-up 1 of 2
adjective
ˈgrōn-ˌəp
: adult entry 1
grown-up
2 of 2noun
: an adult person
grown-up 1 of 3
adjective
as in adult
relating to or typical of adults; displaying proper maturity they have yet to find a grown-up way of handling their marital problems Synonyms & Similar Words
Relevance
- adult
- mature
Antonyms & Near Antonyms
- adolescent
- immature
- childish
- infantile
- kiddish
grown-up
2 of 3noun
as in ancient
a fully grown person once you turn 12, you get to eat with the grown-ups at Thanksgiving Synonyms & Similar Words
- adult
- ancient
- middle-ager
- senior citizen
- oldster
- graybeard
- elder
- senior
- gaffer
- old-timer
Antonyms & Near Antonyms
- kid
- child
- toddler
- tyke
- moppet
- infant
- tike
- adolescent
- baby
- tot
- cub
- youngster
- youth
- juvenile
- bairn
- tad
- teenager
- teen
- minor
- youngling
- tween
- preteen
- teenybopper
- teener
- preteen-ager
grown up
3 of 3verb
as in grown
to become mature everyone has to grow up at some point in their lives Synonyms & Similar Words
- grown
- progressed
- developed
- matured
- ripened
- aged
- evolved
- softened
- blossomed
- got on
- bourgeoned
- flowered
- gotten on
- flourished
- got along
- bloomed
- gotten along
- mellowed
- unfolded
- burgeoned
- opened
- grayed
- advanced
- greyed
Antonyms & Near Antonyms
- declined
- deteriorated
- sunk
- worsened
- dried
- faded
- weakened
- degenerated
- wasted (away)
- decayed
- shriveled
- drooped
- shrivelled
- waned
- wilted
- returned
- flagged
- sagged
- withered
- reverted
- lapsed
- regressed
- retrogressed
- backslidden
- backslid