RichThesaurus
inextinguishable
vs
never-say-die
inextinguishable
adj
Incapable of being extinguished, not extinguishable.
never-say-die
adj
That does not give up in despair; indomitable.
How often have the words
inextinguishable
and
never-say-die
occurred in a corpus of books?
(source:
Google Ngram Viewer
)