2
pertinaciously(adverb, obstinately)
2
pigheadedly(adverb, firmly, determinedly, fixedly, obstinately)
2
precisely
2
strictly
2
tenaciously(adverb, obstinately)
2
toughly
2
uncompromisingly
2
unwaveringly(adverb, definitely, resolutely, determinedly, obstinately)
1
austerely
1
certainly
1
contrarily(adverb, obstinately)
1
contumaciously
1
decidedly
1
earnestly
1
grimly
1
hammer and tongs(expression, idiom)
1
harshly
1
heart and soul(expression, idiom)
1
immutably
1
impenitently
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APASmart Define. (2015). inflexibly thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/inflexibly/thesaurus/synonyms
ChicagoSmart Define. 2015. "inflexibly thesaurus" https://smartdefine.org/inflexibly/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, inflexibly thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/inflexibly/thesaurus/synonyms>.
MLASmart Define. "inflexibly thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/inflexibly/thesaurus/synonyms>