- Definitions|2
- Thesaurus|876
- Abbreviations|0
| live(adjective, energetic, vigorous) | |
| logical(good, sound, right, reasonable, rational) | |
| mighty(strong, powerful, chief, effective, principal) | |
| operation | |
| operational | |
| predominant(adjective, important, ruling) | |
| prestigious | |
| salubrious | |
| sovereign(adjective, strong, energetic, vigorous, capable) | |
| trenchant | |
| up to(verb, phrasal verb, power) | |
| usable(useful, beneficial, advantageous) | |
| utile | |
| valuable(tough, energetic, useful, effective, beneficial) | |
| accurate(sound, reasonable, sensible, rational, wise) | |
| advantageous(adjective, strong, happy, useful, valuable) | |
| all-powerful(strong, energetic, vigorous, capable, chief) | |
| apt(adjective, tough, happy, energetic, active) | |
| astir(moving, active, effective, running, alive) | |
| at work(expression, moving, active, effective, running) |
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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> |