- Definitions|2
- Thesaurus|876
- Abbreviations|0
| auspicious(adjective, strong, happy, positive, fortunate) | |
| businesslike(tough, energetic, effective, adept, effectual) | |
| charismatic | |
| charming | |
| commanding(strong, energetic, powerful, effective, independent) | |
| conducive(tough, energetic, useful, effective, beneficial) | |
| consequential | |
| considerable | |
| considerate(sensible, useful, wise, shrewd, beneficial) | |
| controlling(adjective, strong, energetic, important, powerful) | |
| convenient(adjective, friendly, happy, sympathetic, useful) | |
| correct(adjective, sound, happy, flawless, fortunate) | |
| decisive(tough, energetic, effective, adept, effectual) | |
| economical(tough, energetic, effective, adept, effectual) | |
| effectuality | |
| effectualness | |
| efficiency | |
| enchanting | |
| estimable | |
| excited |
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| APA | Smart Define. (2015). efficacious thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/efficacious/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "efficacious thesaurus" https://smartdefine.org/efficacious/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, efficacious thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/efficacious/thesaurus/synonyms>. |
| MLA | Smart Define. "efficacious thesaurus" 13 October 2015. Web. 22 September 2026. <https://smartdefine.org/efficacious/thesaurus/synonyms> |