schoolboyishly

In a schoolboyish way.

Japanese Meaning

学校の男子生徒のような、少年らしい様子で / 生意気に、または軽妙な少年っぽさをもって

He grinned schoolboyishly when he realized he'd found the missing key.

彼は紛失した鍵を見つけたことに気づくと、少年らしい笑みを浮かべた。

Sense（1）

In a schoolboyish way.

Hari Singh laughed schoolboyishly through the nest of beard.

more schoolboyishly

（ comparative ）

most schoolboyishly

（ superlative ）