contradict

To deny the truth or validity of (a statement or statements).

His testimony contradicts hers.

1651, Thomas Hobbes, Leviathan, London: Andrew Crooke, Chapter 42 “Of Power Ecclesiasticall,” p. 270, […] the Ministers of Christ in this world, have no Power by that title, to Punish any man for not Beleeving, or for Contradicting what they say;

To oppose (a person) by denying the truth or pertinence of a given statement.

Everything he says contradicts me.

Dear Duff, I prithee, contradict thyself, And say it is not so.

To be contrary to (something).

Now no truth can contradict any truth; desirous therefore they were to be taught, how bothe might stand together, that which they knew could not be false, because Christ spake it; and this which to them did seeme true, onely because the Scribes had said it.

[…] as he is going to a house dedicated to joy and mirth, it was fit he should divest himself of whatever was likely to contradict that intention, or be inconsistent with it.

To say things that conflict with each other.

The prime minister contradicted herself during her speech.

To give an order contrary to (another order or wish), oppose (something).

[…] when was the hour I ever contradicted your desire, Or made it not mine too?

1662, Margaret Cavendish, The Matrimonial Trouble, Act II, Scene 21 in Playes written by the thrice noble, illustrious and excellent princess, the Lady Marchioness of Newcastle, London: John Martyn et al., p. 435, Lady Sprightly. What had you to do to contradict my commands? Doll Subtilty. They were not fit to be obey’d, wherefore they were forbid.