tā / zài / yán / sù / de / huì / yì / shàng / xī / pí / xiào / liǎn / dà / jiā / dōu / jué / de / hěn / bù / hé / shì

他在严肃的会议上嬉皮笑脸，大家都觉得很不合适。

He kept grinning mischievously at the serious meeting, and everyone thought it was inappropriate.