Liberal Dictionary English Dictionary
adjective
- not plausible; not having the appearance of truth or credibility: an implausible alibi.
adjective
- not plausible; provoking disbelief; unlikely
1630s; see implausible + -ity.
c.1600, from assimilated form of in- “not, opposite of” (see in- (1)) + plausible. Related: Implausibly.