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Webster 1913 Edition

Adj.

Not capable of being extinguished; extinguishable; unquenchable;

as,

inextinguishable

flame, light, thirst, desire, feuds

“Inextinguishable rage.”

Milton.

Adj.

[in and extinguishable.] That cannot be extinguished; unquenchable; as inextinguishable flame, thirst or desire.

inextinguishable ‎(comparative more inextinguishable, superlative most inextinguishable)

incapable of being extinguished