boyishadjective
uk/ˈbɔɪ.ɪʃ/us/ˈbɔɪ.ɪʃ/used to describe behaviour or characteristics that are like those of a boy:
a boyish grin
She had her hair cut in a boyish style.
Even as an old man he retained his boyish charm.
She found his boyish good looks very attractive.
boyishly
adverb uk/ˈbɔɪ.ɪʃ.li/us/ˈbɔɪ.ɪʃ.li/
He is still boyishly handsome at the age of 45.
boyishness
noun [ U ] /-nəs/
The actor radiates eager boyishness.