[uhn-im-pee-chuh-buh l]


above suspicion; impossible to discredit; impeccable: unimpeachable motives.

Origin of unimpeachable

First recorded in 1775–85; un-1 + impeachable
Related formsun·im·peach·a·bil·i·ty, un·im·peach·a·ble·ness, nounun·im·peach·a·bly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for unimpeachably

Contemporary Examples of unimpeachably

  • Steve Lesher brought in an unimpeachably sourced account of the Supreme Court's deliberations in the Nixon tape case.

    The Daily Beast logo
    Newsweek’s Watergate Legacy

    Jim Doyle

    December 29, 2012

  • So it must be a welcome change for Curry to come back into the public fold in such a unimpeachably positive way.

    The Daily Beast logo
    Ann Curry’s Twitter Rehab

    Lizzie Crocker

    December 23, 2012

Historical Examples of unimpeachably

  • Not folly in believing in him and his authority—on that he was unimpeachably sincere.

  • It is her ambition to lead, but to lead nobly and unimpeachably.

  • 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.


    Anthony Hope

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

British Dictionary definitions for unimpeachably



unquestionable as to honesty, truth, etc
Derived Formsunimpeachability or unimpeachableness, noununimpeachably, 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

Word Origin and History for unimpeachably



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

Online Etymology Dictionary, © 2010 Douglas Harper