Disavow

Part of speech: verb (v.)

1. To refuse strongly and solemnly to own or acknowledge; to deny responsibility for, approbation of, an the like; to disclaim; to disown; as, he was charged with embezzlement, but he disavows the crime. A solemn promise made and disavowed. Dryden.

2. To deny; to show the contrary of; to disprove. Yet can they never Toss into air the freedom of my birth, Or disavow my blood Plantagenet's. Ford.