8
rigidly(adverb, thoroughly, strongly, firmly, definitely)
8
unyieldingly(adverb, firmly, determinedly, fixedly, obstinately)
7
firmly(adverb, rigidly, inelastically)
7
resolutely(adverb, firmly, definitely, determinedly, obstinately)
5
rigorously
4
adamantly(adverb, obstinately)
4
hardly
4
obstinately(adverb, rigidly, obstinately)
4
stiffly(adverb, inelastically)
4
stubbornly(adverb, definitely, resolutely, determinedly, obstinately)
3
immovably(adverb, inelastically)
3
unalterably(adverb, rigidly, inelastically)
3
unchangeably(adverb, rigidly)
2
bullheadedly(adverb, firmly, determinedly, fixedly, obstinately)
2
determinedly(adverb, definitely, resolutely, fixedly, obstinately)
2
doggedly(adverb, firmly, definitely, fixedly, obstinately)
2
fixedly(adverb, thoroughly, strongly, firmly, soundly)
2
hardheadedly(adverb, obstinately)
2
mulishly(adverb, obstinately)
2
persistently
11 years ago|2.6k views|share |citing 
APASmart Define. (2015). inflexibly thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/inflexibly/thesaurus/synonyms
ChicagoSmart Define. 2015. "inflexibly thesaurus" https://smartdefine.org/inflexibly/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, inflexibly thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/inflexibly/thesaurus/synonyms>.
MLASmart Define. "inflexibly thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/inflexibly/thesaurus/synonyms>