INVALIDATING

disconfirming, invalidating

(adjective) establishing as invalid or untrue

Source: WordNet® 3.1

Verb

invalidating

present participle of invalidate

Source: Wiktionary

INVALIDATE

In*val"i*date, v. t. [imp. & p. p. Invalidated; p. pr. & vb. n. Invalidating.] Etym: [From Invalid null.]

Definition: To render invalid; to weaken or lessen the force of; to destroy the authority of; to render of no force or effect; to overthrow; as, to invalidate an agreement or argument.

Source: Webster’s Unabridged Dictionary 1913 Edition