The Collaborative International Dictionary of English v.0.48:

Unorthodox \Unorthodox\
   See orthodox.

WordNet (r) 3.0 (2006):

unorthodox
    adj 1: independent in behavior or thought; "she led a somewhat
           irregular private life"; "maverick politicians" [syn:
           irregular, maverick, unorthodox]
    2: breaking with convention or tradition; "an unorthodox
       lifestyle" [ant: orthodox]

Moby Thesaurus II by Grady Ward, 1.0:

157 Moby Thesaurus words for "unorthodox":
   Albigensian, Arian, Bohemian, Catharist, Donatist, Ebionitist,
   Erastian, Gnostic, Jansenist, Jansenistic, Jovinianist,
   Jovinianistic, Lollard, Manichaean, Monophysite, Monophysitic,
   Montanist, Montanistic, Pelagian, Sabellian, Waldensian, Wyclifite,
   aberrant, abnormal, abroad, adrift, all abroad, all off, all wrong,
   amiss, antinomian, apocryphal, askew, astray, at fault, awry, beat,
   beside the mark, breakaway, capricious, changeable, changing,
   choppy, corrupt, deceptive, defective, delusive, deviant,
   deviating, deviational, deviative, deviatory, different,
   disorderly, dissident, distorted, divaricate, divergent,
   diversified, diversiform, emanationist, erose, errant, erratic,
   erring, erroneous, fallacious, false, far out, faultful, faulty,
   flawed, free and easy, fringy, heretical, heteroclite, heterodox,
   hippie, hylotheist, hylotheistic, illogical, illusory, impulsive,
   inconsistent, inconstant, individualistic, informal,
   inner-directed, irregular, jagged, jerky, kinky, maverick,
   mercurial, motley, mutable, nonconforming, nonconformist,
   nonorthodox, nonstandard, nonuniform, not cricket, not done,
   not kosher, not right, not true, off, off the track, offbeat,
   original, out, pantheist, pantheistic, peccant, perverse,
   perverted, pluralistic, ragged, rough, schismatic, sectarian,
   self-contradictory, spasmodic, sporadic, straying, unaccepted,
   unapproved, unauthentic, unauthoritative, uncanonical, uncommon,
   unconforming, unconventional, uncustomary, unequable, unequal,
   uneven, unfactual, unfashionable, unproved, unscriptural, unsound,
   unstable, unsteady, unsystematic, untrue, ununiform, unusual,
   variable, variegated, variform, various, varying, wavering,
   way out, wide, wrong