contradicter

transitive verb

1. 1. to assert the opposite of (what someone else has said)
   2. to deny the statement of (a person)
2. to declare (a statement, report, etc.) to be false or incorrect
3. to be contrary or opposed to; go against: the facts contradict his theory

Origin: < L contradictus, pp. of contradicere < contra-, contra- + dicere, to speak: see diction

intransitive verb