invalidating

(verb) declare invalid. Synonyms: invalidate, annul, quash, void, avoid, nullify. Examples: "The contract was annulled." "Void a plea."

(verb) make invalid for use. Synonyms: cancel, invalidate. Example: "Cancel cheques or tickets."

(verb) show to be invalid. Synonyms: invalidate, nullify.

(verb) take away the legal force of or render ineffective. Synonyms: invalidate, void, vitiate. Example: "Invalidate a contract."

(adj) establishing as invalid or untrue. Synonyms: disconfirming.