torturous

from WordNet (r) 3.0 (2006)

torturous
    adj 1: extremely painful [syn: {agonizing}, {agonising},
           {excruciating}, {harrowing}, {torturing}, {torturous},
           {torturesome}]

from The Collaborative International Dictionary of English v.0.48

Torturous \Tor"tur*ous\ (t[^o]r"t[-u]r*[u^]s), a.
   Involving, or pertaining to, torture. [R.] "The torturous
   crucifixion." --I. Disraeli.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

41 Moby Thesaurus words for "torturous":
      acute, afflictive, agonizing, atrocious, biting, consuming,
      cramping, cruel, desolating, distressing, excruciating, gnawing,
      grave, griping, hard, harrowing, harsh, heartbreaking,
      heartrending, heartsickening, heartwounding, hurtful, hurting,
      painful, paroxysmal, piercing, poignant, pungent, racking, rending,
      severe, sharp, shooting, spasmatic, spasmic, spasmodic, stabbing,
      stinging, tearing, tormenting, torturing