late 14c., "impudent, shameless, presumptuous," from Old French mal apert "over-ready, impudent," literally "ill-skilled," from mal "badly" (see mal-) + apert "skillful," variant of espert "experienced, skillful, clever" (from Latin expertus; see expert (adj.)). Attested from c. 1300 as the name of the personification of impudence. From mid-15c. as an adverb, "impudently, presumptuously." Related: Malapertly; malapertness.
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