In`con*sist"en*cy (?), n.; pl. Inconsistencies (#). [Cf. F. inconsistance.]

1. The quality or state 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; incompatibility.

There is a perfect inconsistency between that which is of debt and that which is of free gift.

2. Absurdity in argument ore narration; incoherence or irreconcilability in the parts of a statement, argument, or narration; that which is inconsistent.

If a man would register all his opinions upon love, politics, religion, and learning, what a bundle of inconsistencies and contradictions would appear at last!

3. Want of stability or uniformity; unsteadiness; changeableness; variableness.

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

• The state of being inconsistent
  
• (logic) an incompatibility between two propositions that cannot both be true