Synonyms of 'grown-up'
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An adult is a mature, fully developed person. An adult has reached the age when they are legally responsible for their actions.
Children under 14 must be accompanied by an adult.
person of mature age
grown or grown-up person
man or woman
An adult is a fully developed animal.
a pair of adult birds
Thesaurus for grown-up from the Collins English Thesaurus
A grown-up is an adult; used by or to children .