boyishly

Adverb

Meaning

In a boyish manner; like a boy.

Source: Webster's dictionary

boylike manly young youth junior juvenile teen freshly boyish greenly childishly tomboy immaturely gentlemanly youthfully

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lady old ancient grown adult mature

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How do I stay so healthy and boyishly handsome? It's simple. I drink the blood of young runaways. William Shatner

he smiled boyishly at his fiancee Source: Internet