Synonyms|412Antonyms|83|Broader|4Narrower|1Related|376

45 entries under reasonable topic. ×

16
efficient(adjective, good, power, sound, right)
8
cogent(adjective, strong, power, sound)
6
convincing(adjective, strong, sound, energetic)
4
compelling(adjective, strong, sound, energetic)
4
substantial(adjective, good, strong, sound, right)
3
good(sound, right, rational, genuine)
3
sound(sensible, rational, wise, shrewd)
2
logical(good, sound, right, rational)
1
accurate(sound, sensible, rational, wise)
1
just(adjective, good, sound, right)
1
legal(good, sound, right, rational)
1
rational(sound, sensible, wise, shrewd)
1
right(adjective, good, sound, happy)
1
seasonable(adjective, happy, sensible, rational)
1
true(sound, rational)
1
trustworthy(good, sound, right, rational)
0
attested(good, sound, right, rational)
0
authentic(good, sound, right, rational)
0
binding(sound, rational)
0
bona fide(expression, good, sound, right)
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APASmart Define. (2015). efficacious thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/efficacious/thesaurus/synonyms
ChicagoSmart Define. 2015. "efficacious thesaurus" https://smartdefine.org/efficacious/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, efficacious thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/efficacious/thesaurus/synonyms>.
MLASmart Define. "efficacious thesaurus" 13 October 2015. Web. 22 September 2026. <https://smartdefine.org/efficacious/thesaurus/synonyms>