facetious

他俏皮的评论总能让严肃的会议气氛轻松起来。

His ___facetious remarks always lighten up the mood in serious meetings.

大家都从他的调侃语气里听出来，他的道歉一个字都不是真心的。

Everyone could tell from his ___facetious tone that he didn't mean a word of his apology.

当被问及两个小时的延误时，她打趣说下次干脆坐直升机来。

When asked about the two-hour delay, she made a ___facetious remark about taking a helicopter next time.