8
carefully(adverb, thoroughly, fully, completely, earnestly)
7
thoroughly(adverb, absolutely, fully, quite, closely)
7
assiduously(adverb, thoroughly, fully, vigorously, closely)
7
diligently(adverb, thoroughly, seriously, vigorously, closely)
7
industriously(adverb, thoroughly, seriously, vigorously, closely)
6
meticulously
5
laboriously(adverb, thoroughly, vigorously, earnestly, hastily)
5
sedulously
4
exhaustively(adverb, absolutely, very, thoroughly, fully)
3
arduously(adverb, vigorously, earnestly, actively, hastily)
3
earnestly(adverb, thoroughly, fully, completely, hastily)
3
studiously(adverb, vigorously, earnestly, actively, hastily)
3
unremittingly(adverb, thoroughly, fully, vigorously, closely)
2
cautiously
2
completely
2
comprehensively(adverb, absolutely, thoroughly, fully, completely)
2
fastidiously
2
from A to Z(expression, idiom, absolutely, fully, completely)
2
from beginning to end(expression, idiom, adverb, absolutely, fully)
2
fully(adverb, absolutely, thoroughly, completely, entirely)
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APASmart Define. (2015). painstakingly thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/painstakingly/thesaurus/synonyms
ChicagoSmart Define. 2015. "painstakingly thesaurus" https://smartdefine.org/painstakingly/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, painstakingly thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/painstakingly/thesaurus/synonyms>.
MLASmart Define. "painstakingly thesaurus" 19 June 2015. Web. 20 September 2026. <https://smartdefine.org/painstakingly/thesaurus/synonyms>