His cheekiness made everyone laugh, even though it was a bit rude.

cheekiness 是由形容词 cheeky（厚脸皮的、无礼的）加上名词后缀 -ness 构成的名词，表示"厚脸皮、无礼"的行为或特质。在这里指"俏皮、不正经"的言行举止。