Reverse Dictionary: MATURE

ADJECTIVES
1000 ► full-grown; mature → RANK → obs.
1579 ► ‘grown up’; adult, mature → MANLY → obs.
1645 ► grown to maturity; matured → ADULTED → obs.
1883 ► mature, grown-up, adult → MAN-GROWN → Sc.
1896 ► having reached the age of manhood, adult, mature → MAN-LENGTH → Sc.
1911 ► experienced; mature → DRY BEHIND THE EARS → Amer. sl.
1914 ► experienced, mature → DRY BACK OF THE EARS → Amer. sl.
1960 ► veteran, mature → HAIRY-ARSED → HAIRY-ASSED → sl.

NOUNS
1895 ► maturity; perfection → NATURE → Eng. dial.
1900 ► age of maturity → MANOEUVRETY → Ireland

NOUNS, PERSON
1662 ► a girl who is relatively old or mature; a girl who is old enough to cope with adult experiences → BIG GIRL 
1913 ► a mature man lacking masculinity → FUDDY-DUDDY → Amer. dial. (Bk.)
2003 ► a mature, older or old woman → OLD BIRD → UK sl.

VERBS
1894 ► to reach (or have reached) the age by which maturity, experience, or shrewdness should have been gained → SHED ONE’S BABY TEETH → Amer. dial.
1957 ► distinguish which people in a group are truly mature, manly or competent → SORT OUT THE MEN FROM THE BOYS → colloq.