1. Establishing as invalid or untrue
   "The new evidence was disconfirming to the defendant's alibi";
   - invalidating, confutative [rare]
    
2. (medicine) not indicating the presence of microorganisms, disease or a specific condition
   "The test results were disconfirming for bacterial infection";
   - negative

1. Show that something may not be true
   "The new evidence helped to disconfirm the suspect's alibi"

See also: Gram-negative, unsupportive

Antonym: confirming

Encyclopedia: Disconfirm