腕白 わんぱく
wampaku

Noun
na-Adjective

1. naughty; mischievous; unruly

Usually Written in Kana
あのわんぱく小僧 こぞうのいたずらには閉口 へいこうする。
ano wampaku kozōno itazuraniwa hēkō suru.
That naughty boy annoys me by his pranks.