I don't rightly know

I don't rightly know

I'm unsure about something; I don't have a response or suggestion right now. I don't rightly know what they're doing here—I didn't invite them, I swear! I don't rightly know what he was thinking when he made such a ridiculous statement.
See also: know, rightly
Farlex Dictionary of Idioms.

I don't rightly know.

Rur. I do not know. Tom: When will Joe be getting back? Charlie: I don't rightly know. Jane: What's the difference between a first cousin and a first cousin once removed? Mary: I don't rightly know.
See also: know, rightly
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • don't get me wrong
  • don't bet on it
  • all in (one's) head
  • Don’t make a federal case out of it!
  • don't cry before you are hurt
  • don't count your chickens
  • don't give up the ship
  • don't beat a dead horse
  • a thing you don't want is dear at any price