Latin plausibilis deserving applause, equivalent. to plaus(us) (past participle of plaudere to applaud) + -ibilis -ible
1.See corresponding entry in UnabridgedPlausible,specious describe that which has the appearance of truth but might be deceptive. The person or thing that is plausible strikes the superficial judgment favorably; it may or may not be true:a plausible argument(one that cannot be verified or believed in entirely). Specious definitely implies deceit or falsehood; the surface appearances are quite different from what is beneath:a specious pretense of honesty; a specious argument(one deliberately deceptive, probably for selfish or evil purposes).
1.See corresponding entry in Unabridged honest, sincere.