1) Befitting a young lad 2) Boylike 3) Engagingly innocent 4) Engagingly youthful 5) Exclusively Anglo word 6) Exclusively Saxon word 7) Immature 8) Like a stripling 9) Like Peter Pan 10) Like Peter Pan or some grins 11) Like some grins 12) Mannish in a youthful way 13) Of or befitting a boy 14) Peter Pan-like 1) Boylike 2) Schoolboyish 3) Young 
• (a.) Resembling a boy in a manners or opinions; belonging to a boy; childish; trifling; puerile.
Boy'ish adjective Resembling a boy in a manners or opinions; belonging to a boy; childish; trifling; puerile. « A boyish , odd conceit. Baillie. » 
[adj] - befitting or characteristic of a young boy
boylike adjective befitting or characteristic of a young boy; `a boyish grin`; `schoolboyish pranks`
of or befitting a boy; engagingly youthful or innocent: a boyish grin.