indestructible

from WordNet (r) 3.0 (2006)

indestructible
    adj 1: not easily destroyed [ant: {destructible}]
    2: very long lasting; "less durable rocks were gradually worn
       away to form valleys"; "the perdurable granite of the ancient
       Appalachian spine of the continent" [syn: {durable},
       {indestructible}, {perdurable}, {undestroyable}]

from The Collaborative International Dictionary of English v.0.48

Indestructible \In`de*struc"ti*ble\, a. [Pref. in- not +
   destructible: cf. F. indestructible.]
   Not destructible; incapable of decomposition or of being
   destroyed; as, the Russian harvesters had primitive
   electronics, but they were built so sturdily they were almost
   indestructible. -- {In`de*struc"ti*ble*ness}, n. --
   {In`de*struc"ti*bly}, adv.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

68 Moby Thesaurus words for "indestructible":
      ageless, ceaseless, changeless, coeternal, constant, continual,
      continuous, dateless, deathless, durable, endless, enduring,
      eternal, eterne, ever-being, ever-durable, ever-during,
      everlasting, everliving, fixed, immemorial, immortal, immutable,
      imperishable, impregnable, incessant, incorruptible, indelible,
      ineffaceable, ineradicable, inexpugnable, inextinguishable,
      infinite, interminable, invincible, invulnerable, irrefragable,
      lasting, long-lasting, never-ceasing, never-ending, nonperishable,
      nonstop, nonterminating, nonterminous, olamic, perdurable,
      perennial, permanent, perpetual, quenchless, sempiternal, steady,
      timeless, unalterable, unbreakable, unceasing, unchangeable,
      unchanging, undampable, undestroyable, undying, unending,
      unintermitting, uninterrupted, unquenchable, unremitting,
      without end