RichThesaurus
adamantly
vs
obdurately
adamantly
adv
In an immovable or inflexible manner.
obdurately
adv
In an obdurate manner; stubbornly, intractably or inflexibly.
How often have the words
adamantly
and
obdurately
occurred in a corpus of books?
(source:
Google Ngram Viewer
)