Careful readers will detect subtle signs of contradiction in the author's arguments.

The newly canonized nun was hailed as a sign of contradiction, a person whose manifest holiness drew extreme opposition and, in Catholic theology, is thought to point to the presence of the divine.

The philosopher pointed out that the theory's refusal to account for exceptions was a self-contradiction that undermined its credibility.

The politician's speech was riddled with self-contradictions, undermining his credibility.

Her argument was full of contradictions in terms that made it impossible to take her seriously.

In many philosophy courses, the law of non-contradiction is introduced as a basic principle of logic.

The witness spoke contradictingly, making it hard to determine the truth.