This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Characteristic of or befitting a boy: boyish charm.

adj. Like a boy.

adj. Resembling a boy in a manners or opinions; belonging to a boy; childish; trifling; puerile.

Belonging to a boy; pertaining to boyhood; in a disparaging sense, childish, trifling, puerile: as, “a boyish odd conceit,”

Synonyms

adj. befitting or characteristic of a young boy

"_not_ chew gum, but she whistled, and the teachers who reproved her most for what they called a boyish trick, always listened intently, when the clear, musical notes, now soft and low, now loud and shrill, were heard outside, or in the building."

immature    young   

childish    trifling    puerile   

childish    girlish    youthful    frank    feminine    passionate    joyous    eager    playful    wistful