RichThesaurus
never-say-die
vs
unyielding
never-say-die
adj
That does not give up in despair; indomitable.
unyielding
adj
Not giving in; not bending; stubborn.
How often have the words
never-say-die
and
unyielding
occurred in a corpus of books?
(source:
Google Ngram Viewer
)