The Collaborative International Dictionary of English v.0.48:
Tormenting \Tor*ment"ing\, a.
   Causing torment; as, a tormenting dream. --
   Tor*ment"ing*ly, adv.
   [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Torment \Tor*ment"\, v. t. [imp. & p. p. tormented; p. pr. &
   vb. n. tormenting.] [OF. tormenter, F. tourmenter.]
   1. To put to extreme pain or anguish; to inflict excruciating
      misery upon, either of body or mind; to torture. " Art
      thou come hither to torment us before our time? " --Matt.
      viii. 29.
      [1913 Webster]
   2. To pain; to distress; to afflict.
      [1913 Webster]
            Lord, my servant lieth at home sick of the palsy,
            grievously tormented.                 --Matt. viii.
                                                  6.
      [1913 Webster]
   3. To tease; to vex; to harass; as, to be tormented with
      importunities, or with petty annoyances. [Colloq.]
      [1913 Webster]
   4. To put into great agitation. [R.] "[They], soaring on main
      wing, tormented all the air." --Milton.
      [1913 Webster]
Moby Thesaurus II by Grady Ward, 1.0:
77 Moby Thesaurus words for "tormenting":
   acute, afflictive, aggravating, agonizing, annoying, atrocious,
   biting, bothering, bothersome, chafing, consuming, cramping, cruel,
   desolating, disquieting, distressful, distressing, disturbing,
   exasperating, excruciating, fretting, galling, gnawing, grave,
   griping, harassing, hard, harrowing, harsh, heartbreaking,
   heartrending, heartsickening, heartwounding, hurtful, hurting,
   importunate, importune, irking, irksome, irritating, painful,
   paroxysmal, pesky, pestering, pestiferous, pestilent, pestilential,
   piercing, plaguesome, plaguey, plaguing, poignant, provoking,
   pungent, racking, rending, severe, sharp, shooting, spasmatic,
   spasmic, spasmodic, stabbing, stinging, tearing, teasing, tiresome,
   torturing, torturous, troublesome, troubling, upsetting, vexatious,
   vexing, wearisome, worrisome, worrying