honest to a fault

honest to a fault

Honest to an extreme or excessive degree; more honest than is usual or necessary. Jim wouldn't even tell a white lie—he's honest to a fault. It can actually be a little bit irritating sometimes. The police sergeant is honest to a fault, following every regulation and guideline without question.
See also: fault, honest
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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