The Collaborative International Dictionary of English v.0.48:

Unextinguished \Unextinguished\
   See extinguished.

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "unextinguished":
   ablaze, afire, aflame, aflicker, aglow, alight, ardent, blazing,
   burning, candent, candescent, comburent, conflagrant, flagrant,
   flaming, flaring, flickering, fuming, glowing, guttering,
   ignescent, ignited, in a blaze, in a glow, in flames, incandescent,
   inflamed, kindled, live, living, on fire, reeking, scintillant,
   scintillating, smoking, smoldering, sparking, unabated, unallayed,
   unmitigated, unquelled, unquenched, unsoftened, unsubdued,
   untempered