Implausible means too unlikely to be readily believed. An implausible excuse.
It is about believability rather than truth, so a true story can be implausible. Fiction has to avoid the implausible far more carefully than life does, since readers will not accept what actually happens.
1adjectiveimplausibleToo unlikely to be readily believed.
“The explanation was implausible and turned out to be entirely true.”
implausible is a quality.
Latin
plausibilis — deserving applause, praiseworthy, acceptable, pleasing
English
plausible
English, today
implausible
Built from
From in- + plausible. plausible comes from Latin plausibilis (“deserving applause, praiseworthy, acceptable, pleasing”), from the participle stem of plaudere (“to applaud”).
Etymology from Wiktionary, CC BY-SA