
1) Inextinguible 2) Unextinguishable
Found on
https://www.crosswordclues.com/clue/inextinguishable

• (a.) Not capable of being extinguished; extinguishable; unquenchable; as, inextinguishable flame, light, thirst, desire, feuds.
Found on
http://thinkexist.com/dictionary/meaning/inextinguishable/
In`ex·tin'guish·a·ble adjective Not capable of being extinguished; extinguishable; unquenchable; as,
inextinguishable flame, light, thirst, desire, feuds. '
Inextinguishable rage.'
Milton. Found on
http://www.encyclo.co.uk/webster/I/52

[
adj] - difficult or impossible to extinguish
Found on
http://www.webdictionary.co.uk/definition.php?query=inextinguishable
adjective difficult or impossible to extinguish; `an inextinguishable flame`; `an inextinguishable faith`
Found on
https://www.encyclo.co.uk/local/20974

not extinguishable: an inextinguishable fire.
Found on
https://www.infoplease.com/dictionary/inextinguishable
No exact match found.