unquenchable

from WordNet (r) 3.0 (2006)

unquenchable
    adj 1: impossible to quench; "unquenchable thirst" [syn:
           {quenchless}, {unquenchable}]

from The Collaborative International Dictionary of English v.0.48

Unquenchable \Unquenchable\
   See {quenchable}.

from Moby Thesaurus II by Grady Ward, 1.0

60 Moby Thesaurus words for "unquenchable":
      a hog for, acquisitive, all-devouring, avaricious, avid,
      bottomless, coveting, covetous, deathless, devouring, esurient,
      gluttonous, gobbling, grabby, grasping, greedy, hoggish, immortal,
      imperishable, impregnable, incorruptible, indelible,
      indestructible, ineffaceable, ineradicable, inexpugnable,
      inextinguishable, insatiable, insatiate, invincible, invulnerable,
      irrepressible, limitless, mercenary, miserly, money-hungry,
      money-mad, nonperishable, omnivorous, overgreedy, piggish,
      quenchless, rapacious, ravening, ravenous, slakeless, sordid,
      swinish, unappeasable, unappeased, undampable, undestroyable,
      undying, unsated, unsatisfiable, unsatisfied, unslakeable,
      unslaked, venal, voracious