grown upadjective
uk/ˌɡrəʊn ˈʌp/us/ˌɡroʊn ˈʌp/B2 If you say that someone is grown up, you mean that they are an adult or that they behave in a responsible way:
He seems very grown up for a ten-year-old.
This book is a bit too grown up for you (= you are too young to understand this book).
[ before noun ] She has two grown-up children who work in the family business.
More examples
- They're a middle-aged couple, with grown-up children.
- My children are all grown-up now.
- She seems very sensible and grown-up.
- I have to be a bit more grown-up for work.
- I don't feel very grown-up.
Thesaurus: synonyms and related words
Physically and mentally mature & immature
- adult
- ageing
- aging
- an old/a wise head on young shoulders idiom
- babyish
- grown
- head
- immature
- infantile
- juvenile
- make a man (out) of sb idiom
- mature
- maturity
- overgrown
- petulant
- precocious
- precociously
- puerile
- retarded
- young
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You can also find related words, phrases, and synonyms in the topics:
Describing age & birthdays