Deceit or neglect.
Insincerity, irony, or sarcasm.
Indirection.
Backwardness of direction.
The use of a backward flip of the hand.
Leftward slant.
The act of neglecting.
Habitual lack of care.
The state of being neglected.
To fail to do or carry out something due to oversight or carelessness.
To fail to care for or attend to something.
To omit to notice; to forbear to treat with attention or respect; to slight.
To ignore for the sake of simplifying calculations without significantly affecting accuracy.