Meanings
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1
noun
absence of restraint or concealment in speech or behavior; complete frankness or openness (formal or literary)
He discussed the failed campaign with an unreserve that startled the committee.
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Etymology
Formed in English from un- + reserve, using reserve in the sense 'restraint or reticence.' Reserve came through French reserver from Latin reservare ('keep back'). Unreserve therefore describes speech or behavior in which nothing is held back.