inconsistent

a. [ Pref. in- not + consistent: cf. F. inconsistant. ] [ 1913 Webster ]

1. Not consistent; showing inconsistency; irreconcilable; contradictory, or having contradictory implications; discordant; at variance, esp. as regards character, sentiment, or action; incompatible; incongruous. [ 1913 Webster ]

Compositions of this nature . . . show that wisdom and virtue are far from being inconsistent with politeness and good humor. Addison. [ 1913 Webster ]

2. Not exhibiting uniformity of sentiment, steadiness to principle, etc.; unequal; fickle; changeable. [ 1913 Webster ]

Ah, how unjust to nature, and himself,
Is thoughtless, thankless, inconsistent man. Young.

Syn. -- Incompatible; incongruous; irreconcilable; discordant; repugnant; contradictory. -- Inconsistent, Incongruous, Incompatible. Things are incongruous when they are not suited to each other, so that their union is unbecoming; inconsistent when they are opposed to each other, so as render it improper or wrong; incompatible when they can not coexist, and it is therefore impossible to unite them. Habitual levity of mind is incongruous with the profession of a clergyman; it is inconsistent with his ordination vows; it is incompatible with his permanent usefulness. Incongruity attaches to the modes and qualities of things; incompatibility attaches to their essential attributes; inconsistency attaches to the actions, sentiments, etc., of men. [ 1913 Webster ]