84 entries under tough topic. ×

40
powerful(adjective, clear, strong, power, great)
30
efficacious(adjective, strong, power, moving)
28
efficient(adjective, good, strong, power)
24
potent(adjective, clear, strong, great)
23
strong(adjective, clear, strong, power)
23
forceful(adjective, clear, strong, power)
22
productive(adjective, power, energetic, lively)
20
capable(adjective, power, keen, smart)
18
active(adjective, movement, strong, moving)
15
persuasive(adjective, clear, strong, great)
14
competent(adjective, power, keen, bright)
13
virtuous(adjective, feature, characteristic, good, honor)
12
dynamic(adjective, strong, energetic, violent)
12
energetic(adjective, strong, violent, powerful)
12
forcible(adjective, clear, strong, energetic)
11
able(adjective, power, bright, energetic)
9
adequate(adjective, power, energetic, powerful)
8
sound(noun, adjective, clear, strong)
6
proficient(adjective, keen, smart, intelligent)
5
lively(adjective, strong, energetic, powerful)
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APASmart Define. (2015). effective thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/effective/thesaurus/synonyms
ChicagoSmart Define. 2015. "effective thesaurus" https://smartdefine.org/effective/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, effective thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/effective/thesaurus/synonyms>.
MLASmart Define. "effective thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/effective/thesaurus/synonyms>