Synonyms|67Antonyms|76|Broader|12Narrower|14Related|76

61 entries under adjective topic. ×

1
effectual(effect, success, productivity)
1
efficacious(effect, productivity)
1
efficient(effect, productivity)
1
fat
1
fecund
1
fertile
1
fructuous
1
fruitful(effect, productivity)
1
helpful
1
hyperefficient(effect, success, productivity)
1
inventive
1
lush
1
luxuriant
1
of assistance
1
of help
1
of use
1
operative(effect, productivity)
1
original
1
plenteous
1
plentiful
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APASmart Define. (2016). in vain thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/in_vain/thesaurus/antonyms
ChicagoSmart Define. 2016. "in vain thesaurus" https://smartdefine.org/in_vain/thesaurus/antonyms (accessed September 29, 2026).
HarvardSmart Define 2016, in vain thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/in_vain/thesaurus/antonyms>.
MLASmart Define. "in vain thesaurus" 24 March 2016. Web. 29 September 2026. <https://smartdefine.org/in_vain/thesaurus/antonyms>