Etymology
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unimpeachable (adj.)

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

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Definitions of unimpeachable

unimpeachable (adj.)
beyond doubt or reproach;
an unimpeachable source
unimpeachable (adj.)
free of guilt; not subject to blame;
an unimpeachable reputation
unimpeachable (adj.)
completely acceptable; not open to exception or reproach;
Synonyms: unexceptionable
From wordnet.princeton.edu