눈치가 없다 (말이나 행동을 알아차리는데 느림)

A: Did you get the joke?
   - 농담 알아들었어?

B: Not really, I'm a bit too slow.
   - 아니, 나 쫌 눈치가 없어서.

-> slow at taking hints / senseless(insensitive), no sense