The Collaborative International Dictionary of English v.0.48:

Unseemly \Un*seem"ly\, a.
   Not seemly; unbecoming; indecent.
   [1913 Webster]

         An unseemly outbreak of temper.          --Hawthorne.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Unseemly \Un*seem"ly\, adv.
   In an unseemly manner.
   [1913 Webster]

WordNet (r) 3.0 (2006):

unseemly
    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]

Moby Thesaurus II by Grady Ward, 1.0:

168 Moby Thesaurus words for "unseemly":
   Doric, aberrant, abnormal, abominable, atrocious, awkward, bad,
   barbaric, barbarous, cacophonous, chintzy, clumsy, coarse,
   coarsely, crassly, criminal, crude, crudely, delinquent, deviant,
   discreditable, disgraceful, disreputable, doggerel, dysphemistic,
   evil, futile, graceless, gross, grossly, hardly the thing, harsh,
   ignominious, ill-adapted, ill-advised, ill-assorted, ill-chosen,
   ill-considered, ill-fitted, ill-matched, ill-sorted, ill-suited,
   ill-timed, illegal, impolitic, improper, improperly, imprudent,
   impure, in bad taste, inadmissible, inadvisable, inapplicable,
   inapposite, inappropriate, inapt, inauspicious, inconcinnate,
   inconcinnous, incongruous, inconvenient, incorrect, indecent,
   indecently, indecorous, indecorously, indelicate, indelicately,
   indiscreet, inelegant, inelegantly, inept, inexpedient, infamous,
   infelicitous, inopportune, irrelevant, lascivious, lewd, low,
   mal a propos, maladjusted, malapropos, malodorous, misjoined,
   mismatched, mismated, misplaced, naughty, not done, not the thing,
   obscene, off-base, off-color, offensive, offensively,
   out of character, out of joint, out of keeping, out of line,
   out of place, out of proportion, out of season, out of time,
   out of tune, out-of-line, outlandish, raffish, ribaldly, risque,
   rough, roughly, rowdy, rude, rudely, ruffianly, sacrilegious,
   scandalous, shameful, shameless, sinful, tasteless, terrible,
   unadapted, unapt, unbecoming, unbefitting, unbeseeming,
   uncalled-for, uncourtly, uncouth, uncouthly, undecorous,
   undesirable, undignified, undue, uneuphonious, unfelicitous, unfit,
   unfitted, unfitting, unfortunate, ungenteel, ungentlemanly,
   ungodly, ungraceful, unhappy, unladylike, unlawful, unmeet,
   unpolished, unprofitable, unqualified, unrefined, unrighteous,
   unseasonable, unsuitable, unsuited, untasteful, untastefully,
   untimely, untoward, unwise, vulgar, vulgarly, wicked, wrong,
   wrongful