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Wiktionary
schoolboyish

a. Resembling a schoolboy in behaviour.

WordNet
schoolboyish

adj. befitting or characteristic of a young boy; "a boyish grin"; "schoolboyish pranks" [syn: boyish, boylike]

Usage examples of "schoolboyish".

So, almost in a schoolboyish manner, they had concocted a note togetherand, well, that was all.

Over dinner, the Rogues had gained considerable amusement from the account of the invasion of old Simmonss rooms, and they all seemed to have reverted to schoolboyish ways.

Lord knew how many other representatives from the finest families he had offended with this schoolboyish slap in the face to propriety.

Or his new haircut, short and schoolboyish, which was probably intended to make him look young and innocent.

Since I have spoken of my schoolboyish agitation over Marketa, I should point out that it stemmed not so much from my being in love as from my awkward lack of self-assurance, which weighed on me and came to rule my thoughts and feelings much more than Marketa herself.

The handwriting was round and schoolboyish in the tradition of the new education, and the message was in the form of a question.