6
successfully(adverb, feature, state, characteristic)
2
effectively
2
humbly
1
fruitfully
1
productively
1
prolifically
1
rewardingly
1
selflessly
0
abundantly
0
actively
0
advantageously
0
advisably
0
busily
0
circumspectly
0
commandingly
0
compellingly
0
convincingly
0
devastatingly
0
drastically
0
durably
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APASmart Define. (2015). vainly thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/vainly/thesaurus/antonyms
ChicagoSmart Define. 2015. "vainly thesaurus" https://smartdefine.org/vainly/thesaurus/antonyms (accessed September 22, 2026).
HarvardSmart Define 2015, vainly thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/vainly/thesaurus/antonyms>.
MLASmart Define. "vainly thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/vainly/thesaurus/antonyms>