WordNet (r) 3.0 (2006):

overheated
    adj 1: heated beyond a safe or desirable point; "the child
           became overheated"; "overheated metal"

Moby Thesaurus II by Grady Ward, 1.0:

59 Moby Thesaurus words for "overheated":
   ardent, baking, blistering, boiling, broiling, burning,
   burning hot, canicular, ebullient, electric-heated, fervent,
   fervid, feverish, fiery, flaming, flushed, gas-heated, grilling,
   heated, het, het up, hot, hot as fire, hot as hell, hot-air-heated,
   hot-blooded, hotted up, like a furnace, like an oven, oil-heated,
   overwarm, parching, passionate, piping hot, rechauffe, recooked,
   red-hot, reheated, roasting, scalding, scorching, searing,
   seething, simmering, sizzling hot, smoking hot, steam-heated,
   sudorific, superheated, sweating, sweaty, sweltering, sweltry,
   toasting, torrid, warmed, warmed up, warmed-over, white-hot