RichThesaurus
inexterminable
vs
inextirpable
inexterminable
adj
Impossible to exterminate.
inextirpable
adj
Not capable of being extirpated or rooted out; ineradicable.
How often have the words
inexterminable
and
inextirpable
occurred in a corpus of books?
(source:
Google Ngram Viewer
)