departing from the most direct way; circuitous; indirect: a devious course.
without definite course; vagrant: a devious current.
departing from the proper or accepted way; roundabout: a devious procedure.
not straightforward; shifty or crooked: a devious scheme to acquire wealth.

1590–1600; < Latin dēvius out-of-the way, erratic, equivalent to dē- de- + -vius adj. derivative of via way; see -ous

deviously, adverb
deviousness, noun
nondevious, adjective
nondeviously, adverb
nondeviousness, noun
undevious, adjective
undeviously, adverb
undeviousness, noun

1. roundabout, tortuous, involved. 4. subtle, cunning, crafty, artful, sly. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
devious (ˈdiːvɪəs)
1.  not sincere or candid; deceitful; underhand
2.  (of a route or course of action) rambling; indirect; roundabout
3.  going astray from a proper or accepted way; erring
[C16: from Latin dēvius lying to one side of the road, from de- + via road]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1590s, from L. devius "out of the way, remote," from de via (see deviate). Originally in the Latin literal sense; figurative sense of "deceitful" is first recorded 1630s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It's a valid, though underhanded and devious, tactic.
To stay entertained, the impatient mind often stretches to great imaginative
  lengths—sometimes even devious ones.
To be sure, there are devious drug companies and incompetent and crooked
  physicians who will wreak havoc with one's health.
If you prefer the more devious version, so be it.
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