WordNet (r) 3.0 (2006):

inoperable
    adj 1: not able to perform its normal function
    2: not suitable for surgery; "metastasis has rendered the tumor
       inoperable" [ant: operable]

Moby Thesaurus II by Grady Ward, 1.0:

58 Moby Thesaurus words for "inoperable":
   beyond one, beyond recall, beyond remedy, cureless, functionless,
   gone, immedicable, impracticable, impractical, in disrepair,
   inapplicable, incorrigible, incurable, inoperative, insuperable,
   insurmountable, irreclaimable, irrecoverable, irredeemable,
   irreformable, irremediable, irreparable, irretrievable,
   irreversible, irrevocable, lost, nonfunctional, nonutilitarian,
   otiose, out of order, out of whack, past hope, past praying for,
   remediless, ruined, terminal, too much for, unachievable,
   unattainable, uncompassable, unconducive, undoable, undone,
   uneffectible, unemployable, unfit, unhelpful, unmitigable,
   unnegotiable, unperformable, unrealizable, unrelievable,
   unsalvable, unsalvageable, unsuitable, unsurmountable, unusable,
   unworkable