dullard|dullards

别跟那个迟钝的家伙解释笑话了，他从来听不懂。

Don't bother explaining jokes to that ___dullard, he never gets them.

派对上那些无趣的家伙只是坐在角落里玩手机。

The ___dullards at the party just sat in the corner playing with their phones.

会议室里那些迟钝的家伙连最简单的方案都理解不了。

Those ___dullards in the meeting room couldn't even understand the simplest proposal.