The boy's constant rascality, like hiding chalk or pulling chairs, annoyed his teacher.

rascality 是由名词 rascal（淘气鬼、恶作剧者）加上后缀 -ity 构成的名词，表示"恶作剧行为"或"顽皮行为"。rascal 本身指"调皮捣蛋的人"，-ity 是表示性质或状态的名词后缀。