grown–up

1 grown–up /ˈgroʊnˌʌp/ adjective
1 grown–up
/ˈgroʊnˌʌp/
adjective
Britannica Dictionary definition of GROWN–UP
[more grown–up; most grown–up]
1 
: no longer young : fully grown
2 
somewhat informal
a  : suitable for adults
b  : like an adult
2 grown–up /ˈgroʊnˌʌp/ noun
plural grown–ups
2 grown–up
/ˈgroʊnˌʌp/
noun
plural grown–ups
Britannica Dictionary definition of GROWN–UP
[count] somewhat informal
: a person who is fully grown : adult