12
rigidly(adverb, well, thoroughly, strongly, firmly)
9
firmly(adverb, severely, strongly, definitely, sharply)
5
bolt
5
hardly
5
solidly(adverb, severely, thoroughly, strongly, firmly)
5
tightly(adverb, severely, thoroughly, strongly, firmly)
4
inflexibly(adverb, inelastically)
4
strongly(adverb, tenaciously)
4
toughly(adverb, tenaciously)
3
callously(adverb, rigidly)
3
harshly
3
resolutely(adverb, tenaciously)
3
rigorously
3
steadfastly(adverb, tenaciously)
3
unyieldingly(adverb, inelastically)
2
awkwardly
2
enduringly(adverb, well, severely, thoroughly, strongly)
2
obstinately(adverb, tenaciously)
2
pluckily(adverb, tenaciously)
2
securely(adverb, severely, thoroughly, strongly, firmly)
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APASmart Define. (2015). stiffly thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/stiffly/thesaurus/synonyms
ChicagoSmart Define. 2015. "stiffly thesaurus" https://smartdefine.org/stiffly/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, stiffly thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/stiffly/thesaurus/synonyms>.
MLASmart Define. "stiffly thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/stiffly/thesaurus/synonyms>