- Definitions|2
- Thesaurus|876
- Abbreviations|0
| adept(tough, energetic, effective, effectual, well-organized) | |
| adepts | |
| afford | |
| alive(moving, active, effective, running, operating) | |
| applicable(useful, beneficial, advantageous) | |
| appropriate(adjective, happy, beneficial, fortunate, opportune) | |
| astute(sensible, wise, shrewd) | |
| attested(good, sound, right, reasonable, rational) | |
| authentic(good, sound, right, reasonable, rational) | |
| authoritarian(strong, energetic, effective, prevailing, influential) | |
| be effective | |
| be functional | |
| be operative | |
| befitting(adjective, happy, beneficial, fortunate, opportune) | |
| beneficent(useful, beneficial, advantageous) | |
| benevolent(useful, beneficial, advantageous) | |
| bettering(useful, beneficial, advantageous) | |
| binding(sound, reasonable, rational) | |
| bob | |
| bona fide(expression, good, sound, right, reasonable) |
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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> |