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Webster 1913 Edition

Adj.

Incapable of being quenched; inextinguishable;

as,

quenchless

fire or fury

“Once kindled, quenchless evermore.”

Byron.

Syn. – Inextinguishable; unquenchable.

–

Quench′less-ly

adv.

–

Quench′less-ness

Noun.

Adj.

That cannot be quenched or repressed; inextinguishable; as quenchless fire or fury.

quenchless ‎(comparative more quenchless, superlative most quenchless)

That cannot be quenched; unquenchable.
- Patrick Brontë
  To quell the ragings of his Father's ire, / And save a guilty world from quenchless fire!