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1590s, "out of the way," from Latin devius "out of the way, remote, off the main road," from de via (see deviate). Originally in the Latin literal sense; figurative sense of "deceitful" is first recorded 1630s. Related: Deviously; deviousness. Figurative senses of the Latin word were "retired, sequestered, wandering in the byways, foolish, inconsistent."