Etymology
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irreproachable (adj.)

1630s, from French irréprochable (15c.), from assimilated form of in- "not, opposite of" (see in- (1)) + réprochable (see reproach (n.)). Related: Irreproachably.

updated on January 08, 2016

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Definitions of irreproachable from WordNet

irreproachable (adj.)
free of guilt; not subject to blame;
of irreproachable character
From wordnet.princeton.edu, not affiliated with etymonline.