Antonyms of adj schoolgirlish

1 sense of schoolgirlish

Sense 1
girlish, schoolgirlish -- (befitting or characteristic of a young girl; "girlish charm"; "a dress too schoolgirlish for office wear")

INDIRECT (VIA young) -> old -- ((used especially of persons) having lived for a relatively long time or attained a specific age; "his mother is very old"; "a ripe old age"; "how old are you?")

Similarity of adj schoolgirlish

1 sense of schoolgirlish

Sense 1
girlish, schoolgirlish -- (befitting or characteristic of a young girl; "girlish charm"; "a dress too schoolgirlish for office wear")
       => young (vs. old), immature -- ((used of living things especially persons) in an early period of life or development or growth; "young people")