Implausible

Adjective

 * 1) Not plausible; unlikely; dubious.
 * 2) *2008, February 17, Mark Liberman, "More on Harper", Language Log,
 * Harper finds the idea that Latin developed into the modern Romance languages too implausible to believe.

Thesaurus
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, weak

Alternative forms

 * unplausible

Translations

 * Hungarian:
 * Russian: невероятный