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plausible (adj.)

1540s, "acceptable, agreeable; deserving applause or approval" (senses now obsolete), from Latin plausibilis "praiseworthy, pleasing, acceptable," from plaus-, past-participle stem of plaudere "to applaud" (see plaudit). Meaning "having the appearance of truth, apparently right, seemingly worthy of acceptance or approval" is recorded from 1560s; especially "having a specious or superficial appearance of trustworthiness." Related: Plausibly. The expression plausible deniability is from CIA jargon in the 1950s (Allen Dulles sometimes is credited with the first public use); the thing itself is older: "the situation that allows senior officials or powers to deny responsibility for discreditable actions by others in their hierarchy because no one can confirm the deniers knew of the actions."

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Definitions of plausible from WordNet

plausible (adj.)
apparently reasonable and credible, and therefore convincing;
a plausible excuse
plausible (adj.)
given to or characterized by presenting specious arguments;
a plausible liar
From wordnet.princeton.edu