Webster's English Dictionary

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disprove

dis.prove \(')dis-'pru:v\ vt [ME disproven, fr. MF desprover, fr. des- + 
   prover to p]rove : to prove to be false : REFUTE OVE implies the 
   demonstration by any method of the falseness or invalidness of a claim or 
   argument; REFUTE stresses a logical method of disproving; CONFUTE implies 
   reducing an opponent to silence by an overwhelming argument; REBUT suggests 
   formality in the act of answering an argument and does not necessarily 
   imply success in disproving; CONTROVERT stresses the act of opposing with 
   denial or an answering argument and, like REBUT, the attempt to refute an 
   opposing argument without implying success in disproving SYN syn REFUTE, 
   CONFUTE, REBUT, CONTROVERT: DISPR