うすらばか

noun

simpleton; dimwit; sluggard

A mildly derogatory term for a foolish, slow-witted, or lazy person. Often used in casual, colloquial speech. The prefix うすら- adds a nuance of 'somewhat' or 'a bit', softening the insult compared to 馬鹿 alone.

• あいつはうすらばかだから、何なにを言いっても無む駄だだ。

  That guy is a dimwit, so it's no use saying anything to him.

• うすらばかなことを言いうなよ。

  Don't say such stupid things.