7
firmly(adverb, severely, strongly, definitely, strictly)
6
solidly(adverb, severely, thoroughly, strongly, firmly)
5
durably(adverb, well, severely, thoroughly, strongly)
4
constantly
4
immovably
4
permanently
4
steadfastly
4
steadily
3
continuously
3
invariably
3
persistently
3
strongly(adverb, strongly)
3
sturdily(adverb, strongly)
2
consistently
2
enduringly(adverb, well, severely, thoroughly, strongly)
2
fixedly(adverb, severely, thoroughly, strongly, firmly)
2
motionlessly(adverb, well, severely, thoroughly, strongly)
2
resolutely
2
robustly(adverb, strongly)
2
securely(adverb, severely, thoroughly, strongly, firmly)
<123458>
13 years ago|4.5k views|share |citing 
APASmart Define. (2013). stably thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/stably/thesaurus/synonyms
ChicagoSmart Define. 2013. "stably thesaurus" https://smartdefine.org/stably/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2013, stably thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/stably/thesaurus/synonyms>.
MLASmart Define. "stably thesaurus" 17 June 2013. Web. 20 September 2026. <https://smartdefine.org/stably/thesaurus/synonyms>