The Collaborative International Dictionary of English v.0.48:

Deviate \De"vi*ate\, v. i. [imp. & p. p. Deviated; p. pr. &
   vb. n. Deviating.] [L. deviare to deviate; de + viare to
   go, travel, via way. See Viaduct.]
   To go out of the way; to turn aside from a course or a
   method; to stray or go astray; to err; to digress; to
   diverge; to vary.
   [1913 Webster]

         Thus Pegasus, a nearer way to take,
         May boldly deviate from the common track. --Pope.

   Syn: To swerve; stray; wander; digress; depart; deflect; err.
        [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

132 Moby Thesaurus words for "deviating":
   O-shaped, aberrant, aberrative, ambagious, assorted, at odds,
   at variance, backhanded, capricious, changeable, changing, choppy,
   circuitous, circular, contrary, contrasted, contrasting, departing,
   desultory, deviant, deviative, deviatory, devious, different,
   differentiated, differing, digressive, disaccordant, disagreeing,
   discordant, discrepant, discrete, discriminated, discursive,
   disjoined, disorderly, disparate, dissimilar, dissonant, distinct,
   distinguished, divaricate, divergent, diverging, divers, diverse,
   diversified, diversiform, erose, errant, erratic, excursive,
   helical, heterogeneous, impulsive, in disagreement, inaccordant,
   incompatible, incongruous, inconsistent, inconsonant, inconstant,
   indirect, inharmonious, irreconcilable, irregular, jagged, jerky,
   labyrinthine, many, mazy, meandering, mercurial, motley,
   multifarious, mutable, nonconformist, nonstandard, nonuniform,
   oblique, orbital, out-of-the-way, planetary, pluralistic,
   poles apart, poles asunder, ragged, rambling, rotary, rough, round,
   roundabout, roving, separate, separated, serpentine, several,
   shifting, snaky, spasmodic, spiral, sporadic, stray, swerving,
   turning, twisting, unconformable, undirected, unequable, unequal,
   uneven, unlike, unorthodox, unstable, unsteady, unsystematic,
   ununiform, vagrant, variable, variant, varied, variegated,
   variform, various, varying, veering, wandering, wavering,
   widely apart, winding, worlds apart, zigzag