inextinguishable

• unextinguishable (obsolete)

in- +‎ extinguishable

inextinguishable (comparative more inextinguishable, superlative most inextinguishable)

1. Incapable of being extinguished, not extinguishable.
   • 1979 August 11, Lawrence Mass, “Psychiatry on Trial”, in Gay Community News, volume 7, number 4, page 8:

     These achievements were made at a bloody cost and required courage and indomitable honesty, evidence of the inextinguishable will to survive and to be self-actualized in the face of unspeakable dangers.

• unquenchable

• extinguishable