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[uhn-im-pee-chuh-buh l] /ˌʌn ɪmˈpi tʃə bəl/
above suspicion; impossible to discredit; impeccable:
unimpeachable motives.
Origin of unimpeachable
First recorded in 1775-85; un-1 + impeachable
Related forms
unimpeachability, unimpeachableness, noun
unimpeachably, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for unimpeachably
Contemporary Examples
Historical Examples
  • Not folly in believing in him and his authority—on that he was unimpeachably sincere.

    Mrs. Maxon Protests Anthony Hope
  • It is her ambition to lead, but to lead nobly and unimpeachably.

    Search-Light Letters Robert Grant
  • We strive to hope that, though almost as curious, it is not so unimpeachably appropriate as the one quoted above.

  • Yet Miss Quisanté laughed, as a man's relatives often will although the rest of the world is unimpeachably grave.

    Quisant Anthony Hope
  • The authorities on which Mrs. Oliphant relies for her facts are unimpeachably good.

  • Very excitable, he despised and deceived most of the masters; among his friends he was unimpeachably loyal.

    The Loom of Youth Alec Waugh
British Dictionary definitions for unimpeachably


unquestionable as to honesty, truth, etc
Derived Forms
unimpeachability, unimpeachableness, noun
unimpeachably, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for unimpeachably



1784, from un- (1) "not" + impeachable. Related: Unimpeachably.

Online Etymology Dictionary, © 2010 Douglas Harper
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