Real Dictionary

boyish
If you describe a man as boyish, you mean that he is like a boy in his appearance or behaviour, and you find this characteristic quite attractive.

boyish in American English
of, like, or fit for a boy or boys
adjective: of or befitting a boy; engagingly youthful or innocent

boyish in British English
adjective: of or like a boy in looks, behaviour, or character, esp when regarded as attractive or endearing