English to English

adverb (r)

• easy to believe on the basis of available evidence(adv.all)

  Example:
  He talked plausibly before the committee.
  

  Synonym:
  believably, credibly, probably
  Antonym:
  implausibly, improbably, incredibly, unbelievably
  

  source: wordnet30
• In a plausible manner.(adverb)

  source: webster1913