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Use "schoolboyish" in a sentence
"These strike me as slightly schoolboyish -- "Well, you say yes, but your friends say no, nyah, nyah" -- perhaps reflecting the growing desperation of a government increasingly anxious to extricate itself from what is, in fact, clear involvement in a war crime."
"At 41 years old, Mr. Refn has a schoolboyish air, neatly dressed in a white shirt, khakis and black glasses."
"It was about studies and lessons, dealing with the rudiments of knowledge, and the schoolboyish tone of it conflicted with the big things that were stirring in him - with the grip upon life that was even then crooking his fingers like eagle's talons, with the cosmic thrills that made him ache, and with the inchoate consciousness of mastery of it all."