12
firmly(adverb, firm, severely, thoroughly, fully)
9
tightly(adverb, hard, firm, thoroughly, strongly)
8
fast(adjective, adverb, firm, thoroughly, strongly)
6
fixedly(adverb, hard, firm, thoroughly, strongly)
6
solidly(adverb, hard, firm, thoroughly, strongly)
6
surely(adverb, safely)
4
safely(adverb, safely)
4
tenaciously(adverb, firm, firmly, definitely, resolutely)
4
tight(adverb, hard, firm, thoroughly, strongly)
3
firm(hard, firmly, steadfastly)
3
inviolably(adverb, safely)
3
rigidly(adverb, severely, thoroughly, strongly, firmly)
3
snugly(adverb, tightly)
3
steadily(adverb, firm, powerfully, strongly, firmly)
2
cautiously(adverb, defensively)
2
certainly
2
cozily
2
durably(adverb, severely, thoroughly, strongly, firmly)
2
easily
2
gainly
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APASmart Define. (2015). securely thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/securely/thesaurus/synonyms
ChicagoSmart Define. 2015. "securely thesaurus" https://smartdefine.org/securely/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, securely thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/securely/thesaurus/synonyms>.
MLASmart Define. "securely thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/securely/thesaurus/synonyms>