The Collaborative International Dictionary of English v.0.48:

Untoward \Un*to"ward\, prep. [Unto + -ward.]
   Toward. [Obs.] --Gower.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Untoward \Un*to"ward\, a. [Pref. un- not + toward.]
   [1913 Webster]
   1. Froward; perverse. "Save yourselves from this untoward
      generation." --Acts ii. 40.
      [1913 Webster]

   2. Awkward; ungraceful. "Untoward words." --Creech. "Untoward
      manner." --Swift.
      [1913 Webster]

   3. Inconvenient; troublesome; vexatious; unlucky;
      unfortunate; as, an untoward wind or accident.
      [1913 Webster] -- Un*to"ward*ly, adv. --
      Un*to"ward*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

untoward
    adj 1: not in keeping with accepted standards of what is right
           or proper in polite society; "was buried with indecent
           haste"; "indecorous behavior"; "language unbecoming to a
           lady"; "unseemly to use profanity"; "moved to curb their
           untoward ribaldry" [syn: indecent, indecorous,
           unbecoming, uncomely, unseemly, untoward]
    2: contrary to your interests or welfare; "adverse
       circumstances"; "made a place for themselves under the most
       untoward conditions" [syn: adverse, inauspicious,
       untoward]

Moby Thesaurus II by Grady Ward, 1.0:

152 Moby Thesaurus words for "untoward":
   adverse, annoying, antagonistic, apocalyptic, awkward, bad,
   baleful, baneful, black, bleak, bodeful, boding, boorish,
   conflicting, contrary, counter, counteractive, criminal, dark,
   detrimental, difficult, dire, discouraging, doomful, dreary, evil,
   evil-starred, fateful, foolish, foreboding, fractious, gloomy,
   hapless, hard, harmful, hostile, ill, ill-boding, ill-conceived,
   ill-considered, ill-fated, ill-omened, ill-seasoned, ill-starred,
   ill-timed, impolite, improper, imprudent, in opposition,
   inaccurate, inappropriate, inauspicious, inconvenient, indecent,
   indecorous, indelicate, indocile, inexpedient, infelicitous,
   inferior, inimical, inopportune, intempestive, intractable,
   intrusive, invalid, irrelevant, irritating, late, lowering,
   luckless, mal a propos, malapropos, malevolent, malodorous,
   menacing, miserable, mistimed, not easy, of evil portent, off base,
   ominous, opposed, opposing, opposite, out of line, out of phase,
   out of time, peccant, portending, portentous, premature,
   recalcitrant, rigorous, rough, rude, silly, sinful, sinister,
   somber, star-crossed, stressful, stupid, tactless, threatening,
   too late, too soon, troublesome, troublous, trying, unapt,
   unbecoming, unbefitting, uncalled-for, undecorous, undiplomatic,
   undisciplined, unfavorable, unfit, unfitting, unfortunate,
   ungentlemanly, ungodly, ungovernable, unhandy, unhappy, unhealthy,
   unkind, unladylike, unlucky, unmanageable, unpleasant, unpromising,
   unpropitious, unready, unrefined, unripe, unseasonable, unseemly,
   unskillful, unsuitable, untactful, untimely, unwarranted, unwise,
   vexatious, vexing, vicious, wicked, wild, wretched, wrong