The Collaborative International Dictionary of English v.0.48:

Pleasureless \Pleas"ure*less\, a.
   Devoid of pleasure. --G. Eliot.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "pleasureless":
   anguished, anxious, bored, cheerless, depressed, discontented,
   disgusted, grim, humorless, in bad humor, infestive, joyless,
   mirthless, miserable, nauseated, nauseous, out of humor,
   out of sorts, prey to malaise, repelled, revolted, sad, sickened,
   sorry, sorryish, suffering angst, uncheerful, uncheery, uneasy,
   unfulfilled, ungratified, unhappy, unjoyful, unmirthful, unquiet,
   unsatisfied, unsmiling, wretched