244 entries under adjective topic. ×

3
fallacious(poor, absurd, irrational, unconvincing)
3
foolish(strange, crazy, insane, absurd)
3
hard to believe(expression, idiom)
3
impracticable(doubtful, unlikely, impossible)
3
incongruous
3
invalid(poor, false, unreasonable, inadequate)
3
irrational(false, strange, crazy, unreasonable)
3
nonsensical(strange, crazy, insane, absurd)
3
obscure(likely, unlikely, unbelievable, improbable)
3
outlandish(hard, difficult, extraordinary, amazing)
3
poor(slight, flat, thin, false)
3
puzzling(likely, unlikely, unbelievable, improbable)
3
senseless(false, unreasonable, absurd, irrational)
3
slight(flat, poor, thin, inadequate)
3
thick(great, flat, poor, thin)
2
silly(absurd, excessive, expensive, steep)
2
anachronistic
2
bizarre(strange, fantastic, doubtful, dubious)
2
fanciful(strange, fantastic, doubtful, rare)
2
farcical
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APASmart Define. (2015). implausible thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/implausible/thesaurus/synonyms
ChicagoSmart Define. 2015. "implausible thesaurus" https://smartdefine.org/implausible/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, implausible thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/implausible/thesaurus/synonyms>.
MLASmart Define. "implausible thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/implausible/thesaurus/synonyms>