The Collaborative International Dictionary of English v.0.48:

Unsuited \Unsuited\
   See suited.

WordNet (r) 3.0 (2006):

unsuited
    adj 1: not easy to combine harmoniously [syn: ill-sorted,
           incompatible, mismated, unsuited]

Moby Thesaurus II by Grady Ward, 1.0:

59 Moby Thesaurus words for "unsuited":
   disappointing, disqualified, ill-adapted, ill-assorted, ill-chosen,
   ill-equipped, ill-fitted, ill-furnished, ill-matched, ill-provided,
   ill-sorted, ill-suited, ill-timed, improper, inadequate,
   inadmissible, inapplicable, inapposite, inappropriate, inapt,
   incapable, incompetent, inept, infelicitous, irrelevant,
   mal a propos, maladjusted, malapropos, misjoined, mismatched,
   mismated, misplaced, objectionable, 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, unacceptable, unadapted,
   unapt, unarmed, unbecoming, unbefitting, unequipped, unfit,
   unfitted, unfitting, unmeet, unprovided, unqualified, unseasonable,
   unseemly, unsuitable, untimely