4
strictly(adverb, just, severely, thoroughly, precisely)
4
thickly(adverb, tightly, densely)
4
thoroughly(adverb, well, happily, fully, completely)
4
tightly(adverb, strongly, firmly, forcefully, thickly)
4
well(adverb, pleasantly, happily, intimately, capably)
3
accurately
3
adjacently(adverb, nearly)
3
faithfully(adverb, just, thoroughly, precisely, carefully)
3
hard(adverb, near, thoroughly, earnestly, strongly)
3
intently(adverb, thoroughly, earnestly, carefully, sharply)
3
meticulously(adverb, thoroughly, carefully, faithfully, minutely)
3
mutually(combined, jointly, collectively)
3
proximately(adverb, roughly, around, about, nearly)
3
similarly(adverb, thoroughly, carefully, meticulously, faithfully)
3
solidly
3
studiously
2
about
2
all but(expression, idiom)
2
attentively(adverb, hard, happily, thoroughly, fully)
2
barely
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APASmart Define. (2015). closely thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/closely/thesaurus/synonyms
ChicagoSmart Define. 2015. "closely thesaurus" https://smartdefine.org/closely/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, closely thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/closely/thesaurus/synonyms>.
MLASmart Define. "closely thesaurus" 4 December 2015. Web. 20 September 2026. <https://smartdefine.org/closely/thesaurus/synonyms>