67 entries under tough topic. ×

43
effective(adjective, good, strong, power)
13
active(adjective, strong, direct, energetic)
9
powerful(adjective, good, strong, power, direct)
5
energetic(adjective, strong, direct, violent)
5
potent(adjective, good, strong, direct, sound)
4
dynamic(adjective, strong, energetic, powerful)
4
forcible(adjective, strong, direct, energetic)
4
strong(adjective, good, sound, right)
3
sound(adjective, strong, direct, reasonable)
2
brisk(adjective, strong, intense, energetic)
2
careful(adjective, complete, exact, full)
2
exact(adjective, complete, full, ordinary)
2
forceful(adjective, strong, direct, intense)
2
lively(adjective, strong, energetic, powerful)
2
painstaking(adjective, complete, exact, full)
2
persuasive(adjective, good, strong, direct, sound)
2
robust(adjective, strong, intense, energetic)
1
all-embracing(complete, full, conscientious, exhaustive)
1
all-out(complete, full, conscientious, exhaustive)
1
all the way(expression, idiom, complete, full)
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APASmart Define. (2015). efficient thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/efficient/thesaurus/synonyms
ChicagoSmart Define. 2015. "efficient thesaurus" https://smartdefine.org/efficient/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, efficient thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/efficient/thesaurus/synonyms>.
MLASmart Define. "efficient thesaurus" 13 April 2015. Web. 21 September 2026. <https://smartdefine.org/efficient/thesaurus/synonyms>