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Adjective: disconfirming  ,dis-kun'fur-ming
  1. Establishing as invalid or untrue
    - invalidating, confutative [rare]
  2. (medicine) not indicating the presence of microorganisms, disease or a specific condition
    - negative
Verb: disconfirm  ,dis-kun'furm
  1. Show that something may not be true

See also: Gram-negative, unsupportive