Word Study
implausible
CIDE DICTIONARY
implausible, a. [Pref. im- not + plausible: cf. F. implausible.].
Not plausible; not wearing the appearance of truth or credibility, and not likely to be believed. Swift.
OXFORD DICTIONARY
implausible, adj. not plausible.
Derivative
implausibility n. implausibly adv.
THESAURUS
implausible
a bit thick, a bit thin, absurd, beyond belief, debatable, doubtable, doubtful, dubious, dubitable, fishy, flimsy, hard of belief, hard to believe, hardly possible, improbable, inconceivable, incredible, more than doubtful, not deserving belief, open to doubt, open to suspicion, passing belief, preposterous, problematic, puzzling, questionable, ridiculous, staggering belief, suspect, suspicious, tall, thick, thin, unbelievable, unconvincing, unearthly, ungodly, unimaginable, unlikely, unpromising, unreasonable, unsubstantial, unthinkable, unworthy of belief, weakFor further exploring for "implausible" in Webster Dictionary Online