Inconsistency

It is much to be wished that slavery may be abolished. The honour of the States, as well as justice and humanity, in my opinion, loudly call upon them to emancipate these unhappy people. To contend for our own liberty, and to deny that blessing to others, involves an inconsistency not to be excused.

Source: tatoeba (6003110)

Many languages have a lot of inconsistency.

Source: tatoeba (6143165)

I find it interesting that you've argued so hard for drastic reduction of the number of names in sentences as a means of preventing near-duplicates, and yet you're arguing for intentionally adding another kind of near-duplicates. You should think about that inconsistency.

Source: tatoeba (8607283)

It was a strange inconsistency, but never till then had I been so much struck with the worthless and frivolous life of society. Never till then did I feel the deep and eternal debt of gratitude that human nature owes to those who assert its higher influence; who feel their generous activity stirred by a thrice noble emulation; who appeal from the present to the future, and redeem their kind, by shewing of how much that is good and great ambition and genius are capable.

Source: wiktionary