paradox
Meaning: an apparently contradictory statement that is perhaps true
Usage: The teacher noted the paradox that taking a short break helped the class finish faster.
antithesis
Meaning: the absolute opposite
Usage: Her careful planning was the antithesis of his impulsive approach.
contravene
Meaning: to contradict, oppose, violate
Usage: Edwidge contravened his landlady’s rule against overnight guests.
transgress
Meaning: to violate, go over a limit
Usage: The criminal’s actions transgressed morality and human decency.