Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: plausibilis 'worth applauding', from plaudere; PLAUDITS

plausible

 adjective
     
plau‧si‧ble
1 reasonable and likely to be true or successful [≠ implausible]:
His story certainly sounds plausible.
a plausible explanation
2 someone who is plausible is good at talking in a way that sounds reasonable and truthful, although they may in fact be lying:
a plausible liar
—plausibly adverb
—plausibility noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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