Synonyms|426Antonyms|151|Broader|0Narrower|0Related|307
6
firmly(adverb, firm, severely, thoroughly, strongly)
5
fast(adjective, firm, thoroughly, strongly, firmly)
5
rationally(adverb, reasonably)
5
reasonably(adverb, manner, reasonably)
4
heartily
4
thoroughly
3
cogently(adverb, reasonably)
3
good
3
intelligently(adverb, reasonably)
3
logically(adverb, reasonably)
3
securely(adverb, hard, firm, severely, thoroughly)
3
sensibly(adverb, reasonably)
3
solidly(adverb, hard, firm, severely, thoroughly)
3
well(adverb, pleasantly, happily, capably)
2
completely
2
deductively(adverb, reasonably)
2
deeply(adverb, hard, firm, firmly)
2
durably(adverb, well, severely, thoroughly, strongly)
2
fully
2
healthily
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ChicagoSmart Define. 2015. "soundly thesaurus" https://smartdefine.org/soundly/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, soundly thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/soundly/thesaurus/synonyms>.
MLASmart Define. "soundly thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/soundly/thesaurus/synonyms>