WordWeb Online

1. Indirect in departing from the accepted or proper way; misleading
   "used devious means to achieve success"
   - oblique
    
2. Characterized by insincerity or deceit; evasive
   "a devious character"
   - shifty
    
3. Deviating from a straight course
   "a scenic but devious route"
   - circuitous, roundabout

See also: deviously, deviousness, indirect, untrustworthy, untrusty