Implausible

a.

1.

Not plausible; not wearing the appearance of truth or credibility, and not likely to be believed.

Adj.	1.	implausible - having a quality that provokes disbelief; "gave the teacher an implausible excuse" Antonyms: plausible - apparently reasonable and valid
	2.	implausible - highly imaginative but unlikely; "a farfetched excuse"; "an implausible explanation" Synonyms: farfetched

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