The Collaborative International Dictionary of English v.0.48:

Sweaty \Sweat"y\, a. [Compar. Sweatier; superl. Sweatiest.]
   1. Moist with sweat; as, a sweaty skin; a sweaty garment.
      [1913 Webster]

   2. Consisting of sweat; of the nature of sweat.
      [1913 Webster]

            No noisome whiffs or sweaty streams.  --Swift.
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   3. Causing sweat; hence, laborious; toilsome; difficult. "The
      sweaty forge." --Prior.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

53 Moby Thesaurus words for "sweaty":
   ardent, baking, bathed in sweat, beaded with sweat, blistering,
   boiling, broiling, burning, burning hot, canicular, clammy,
   diaphoretic, drenched, drenched with sweat, ebullient, feverish,
   flushed, grilling, heated, hot, hot as fire, hot as hell,
   in a sweat, like a furnace, like an oven, overheated, overwarm,
   parching, perspiring, perspiry, piping hot, red-hot, roasting,
   scalding, scorching, searing, seething, simmering, sizzling hot,
   smoking hot, sticky, sudatory, sudoric, sudorific, sweating,
   sweltering, sweltry, toasting, torrid, wet, wet with sweat,
   white-hot, wilted