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