5
purely
4
thoughtfully(adverb, fully, precisely, correctly, carefully)
4
attentively(adverb, happily, fully, completely, precisely)
4
clean(adverb, informal, big, limited)
4
dead(adverb, big, limited)
4
downright
4
exceedingly
4
hugely
4
in full(expression, adverb, absolutely, fully, completely)
4
mindfully(adverb, closely, carefully, meticulously, faithfully)
4
minutely(adverb, closely, carefully, meticulously, faithfully)
4
plumb
4
positively
4
soundly
4
strictly(adverb, severely, closely, carefully, firmly)
4
terribly(adverb, very)
4
thoroughgoingly
4
through and through(verb, idiom, adverb, phrasal verb, big)
4
unequivocally
3
backwards and forwards(expression, idiom, adverb, detail)
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APASmart Define. (2015). thoroughly thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/thoroughly/thesaurus/synonyms
ChicagoSmart Define. 2015. "thoroughly thesaurus" https://smartdefine.org/thoroughly/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, thoroughly thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/thoroughly/thesaurus/synonyms>.
MLASmart Define. "thoroughly thesaurus" 19 June 2015. Web. 22 September 2026. <https://smartdefine.org/thoroughly/thesaurus/synonyms>