Insincerity, irony, or sarcasm.
Deceit or neglect.
Indirection.
Backwardness of direction.
The use of a backward flip of the hand.
Leftward slant.
Humour, especially when clever or quick.
Sanity.
A person who tells funny anecdotes or jokes; someone witty.
The ability to think quickly; mental cleverness, especially under short time constraints.
Intellectual ability; faculty of thinking, reasoning.
Intelligence; common sense.