PLAUSIBLY
credibly, believably, plausibly, probably
(adverb) easy to believe on the basis of available evidence; “he talked plausibly before the committee”; “he will probably win the election”
Source: WordNet® 3.1
Etymology
Adverb
plausibly (comparative more plausibly, superlative most plausibly)
(manner) In a plausible manner.
(modal) Not falsifiably, based on available facts and general knowledge.
Antonyms
• implausibly
Source: Wiktionary
Plau"si*bly, adv.
1. In a plausible manner.
2. Contentedly, readily. [Obs.]
The Romans plausibly did give consent. Shak.
PLAUSIBLE
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