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Webster 1913 Edition

adv.

In a plausible manner.

Contentedly, readily.

[Obs.]

The Romans

plausibly

did give consent.

Shakespeare

adv.

With fair show; speciously; in a matter adapted to gain favor or approbation.

They could talk plausibly about what they did not understand.

plausibly ‎(comparative more plausibly, superlative most plausibly)

(manner) In a plausible manner.
She lied plausibly, but the police suspected her anyway.
(modal) Not falsifiably, based on available facts and general knowledge.
Plausibly, she said she'd been working at the time.

in a plausible manner

not falsifiably