Devious

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late 16th century: from Latin devius (from de- ‘away from’ + via ‘way’) + -ous. The original sense was ‘remote’; the later sense ‘departing from the direct route’ gave rise to the figurative sense ‘deviating from the straight way’ and hence ‘skilled in underhand tactics’.

wiktionary

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1590s, "out of the common or direct way," from Latin devius "out of the way, remote, off the main road," from de via; from de "off" (see de-) + via "way, road" (see via). Compare deviate. Originally in the Latin literal sense; the 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."

etymonline

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devious (adj.)

1590s, "out of the common or direct way," from Latin devius "out of the way, remote, off the main road," from de via; from de "off" (see de-) + via "way, road" (see via). Compare deviate. Originally in the Latin literal sense; the 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."