Adjective plausible has 4 senses
  1. plausible - apparently reasonable and valid
    Antonyms:
    implausible, improbable, unbelievable, unconvincing, unlikely
  2. probable, likely, plausible - likely but not certain to be or become true or real; "a likely result"; "he foresaw a probable loss"
  3. likely, plausible - within the realm of credibility; "not a very likely excuse"; "a plausible story"
    Antonyms: incredible, unbelievable (indirect, via credible)
  4. credible, plausible - appearing to merit belief or acceptance; "a credible witness"; "a plausible story"
    Antonym: unconvincing (indirect, via convincing)
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