Clue free

Without a clue. Unknowing of the obvious. Incrementally worse than clueless.

After Jane blew Bob off for the third time, Cindy said, "Wow, Bob really is clue free, isn't he?"

cluevoid

Incrementally worse than clueless and clue free. Completely devoid of any clue.
Apparently, a sub species of humanoids.

Only cluevoids believe that immigration is good for this country