4
puissant(adjective, clear, strong, power, energetic)
4
remarkable(intense, powerful, outstanding, worthy, notable)
4
responsible(adjective, keen, smart, intelligent, competent)
4
ruling(strong, energetic, powerful, dynamic, independent)
4
skillful(adjective, tough, keen, smart, bright)
4
solid(adjective, clear, sound, extraordinary, important)
4
sovereign(strong, energetic, chief, independent, principal)
4
substantial
4
sure(reliable, dependable)
4
usable(adjective, useful, practical, running, beneficial)
4
valuable(adjective, good, tough, energetic, proper)
3
accomplished(adjective, tough, keen, smart, energetic)
3
almighty(strong, power, powerful, chief, principal)
3
applicable(adjective, useful, beneficial, advantageous, utilizable)
3
authoritarian(adjective, strong, energetic, powerful, dynamic)
3
basic
3
businesslike(adjective, tough, practical, controlled, orderly)
3
chief(adjective, important, essential)
3
commodious(adjective, good, valuable, practical, helpful)
3
convenient(adjective, good, simple, proper, useful)
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APASmart Define. (2015). effective thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/effective/thesaurus/synonyms
ChicagoSmart Define. 2015. "effective thesaurus" https://smartdefine.org/effective/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, effective thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/effective/thesaurus/synonyms>.
MLASmart Define. "effective thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/effective/thesaurus/synonyms>