Source : Webster's Revised Unabridged Dictionary (1913)

Devious \De"vi*ous\, a. [L. devius; de + via way. See
   {Viaduct}.]
   1. Out of a straight line; winding; varying from directness;
      as, a devious path or way.

   2. Going out of the right or common course; going astray;
      erring; wandering; as, a devious step.

   Syn: Wandering; roving; rambling; vagrant. -- {De"vi*ous*ly},
        adv. -- {De"vi*ous*ness}, n.

Source : WordNet®

deviousness
     n 1: the quality of being oblique and rambling indirectly [syn: {obliqueness}]
     2: the quality of being deceitful and underhanded [syn: {crookedness}]