invalidate

[in-val-i-deyt]
verb (used with object), invalidated, invalidating.
1.
to render invalid; discredit.
2.
to deprive of legal force or efficacy; nullify.

Origin:
1640–50; invalid2 + -ate1

invalidation, noun
invalidator, noun


1. weaken, impair; disprove, refute, rebut.
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World English Dictionary
invalidate (ɪnˈvælɪˌdeɪt)
 
vb
1.  to render weak or ineffective, as an argument
2.  to take away the legal force or effectiveness of; annul, as a contract
 
invali'dation
 
n
 
in'validator
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
If a liar tells us that lying is wrong, this makes him a hypocrite, but it does
  not invalidate his claim.
But that confluence of interest doesn't necessarily invalidate the findings.
But these setbacks do not invalidate the notion of collective action.
It doesn't invalidate the estimates to make these allowances.
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