the GNU version of the Collaborative International Dictionary of English
adj. Not capable of being extinguished; extinguishable; unquenchable.
The Century Dictionary and Cyclopedia
Not extinguishable; incapable of being extinguished; unquenchable.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. difficult or impossible to extinguish
Word Usage
"We leave that to the lesser creatures, who spend their courtship loudly protesting how unutterable, immeasurable, and inextinguishable is their love, as though, forsooth, each dreaded lest the other deem it a bad bargain."