[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 unimpeachable

Contemporary Examples of unimpeachable

  • Her advice, sugarcoated in goofy catchphrases, is delivered in the unimpeachable rhetoric of common sense.

    The Daily Beast logo
    Can Suze Orman Save America?

    Adam Auriemma

    November 10, 2013

  • Anne Sinclair was as unimpeachable as Barbara Walters, as luscious as Diane Sawyer, as authoritative as both.

  • In short, Ted Olson has unimpeachable conservative credentials.

    The Daily Beast logo
    The GOP's Gay Fiasco

    Mark McKinnon

    September 21, 2010

  • “There is only one truth that is unimpeachable about health care,” Stern continued.

    The Daily Beast logo
    Howard Dean Splits the Left

    Dana Goldstein

    December 17, 2009

  • He said that in his experience McChrystal was a man of unimpeachable integrity.

    The Daily Beast logo
    Gen. McChrystal's Credibility Problem

    Jon Krakauer

    October 14, 2009

Historical Examples of unimpeachable

British Dictionary definitions for unimpeachable



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 unimpeachable

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

Online Etymology Dictionary, © 2010 Douglas Harper