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unimpeachable

[uhn-im-pee-chuh-buh l] /ˌʌn ɪmˈpi tʃə bəl/
adjective
1.
above suspicion; impossible to discredit; impeccable:
unimpeachable motives.
Origin
1775-1785
1775-85; un-1 + impeachable
Related forms
unimpeachability, unimpeachableness, noun
unimpeachably, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for unimpeachable

unimpeachable

/ˌʌnɪmˈpiːtʃəbəl/
adjective
1.
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 unimpeachable
adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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