In′con-sist′ence or In′con-sist′en-cy, n.

n. [Fr. inconsistance, Sp. inconsistencia, It. inconsistenza.] 1. The quality of being inconsistent; discordance in respect to sentiment or action; such contrariety between two things that both can not exist or be true together; disagreement. There is a perfect inconsistency between that which is of debt and that which is of free gift. South.

2. Absurdity in argument or narration; irreconcilability in the parts of a statement, argument, or narration.
3. Want of agreement or uniformity; incongruity; unsteadiness; changeableness; as, the inconsistency of a man with himself.

Mutability of temper, and inconsistency with ourselves, is the greatest weakness of human nature. Addison.