PLAUSIBLE
plausible
(adjective) apparently reasonable and credible, and therefore convincing; “a plausible excuse”
plausible
(adjective) given to or characterized by presenting specious arguments; “a plausible liar”
Source: WordNet® 3.1
Etymology
Adjective
plausible (comparative more plausible, superlative most plausible)
Seemingly or apparently valid, likely, or acceptable; conceivably true or likely
Obtaining approbation; specifically pleasing; apparently right; specious.
(obsolete) Worthy of being applauded; praiseworthy; commendable; ready.
Source: Wiktionary
Plau"si*ble, a. Etym: [L. plausibilis praiseworthy, from plaudere,
plausum, to applaud, clap the hands, strike, beat.]
1. Worthy of being applauded; praiseworthy; commendable; ready.
[Obs.] Bp. Hacket.
2. Obtaining approbation; specifically pleasing; apparently right;
specious; as, a plausible pretext; plausible manners; a plausible
delusion. "Plausible and popular arguments." Clarendon.
3. Using specious arguments or discourse; as, a plausible speaker.
Syn.
– Plausible, Specious. Plausible denotes that which seems
reasonable, yet leaves distrust in the judgment. Specious describes
that which presents a fair appearance to the view and yet covers
something false. Specious refers more definitely to the act or
purpose of false representation; plausible has more reference to the
effect on the beholder or hearer. An argument may by specious when it
is not plausible because its sophistry is so easily discovered.
Source: Webster’s Unabridged Dictionary 1913 Edition