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unimpeachable

[uhn-im-pee-chuh-buh l]
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adjective
  1. 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. 2018

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British Dictionary definitions for unimpeachable

unimpeachable

adjective
  1. 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

adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper