1 Those sneaky lawyers misrepresented what occurred, made up all sorts of implausible alternative scenarios to confuse the jurors, and in general depended on chicanery to win the case.
2 Though her alibi seemed implausible, it in fact turned out to be true.
3 I had to admit it sounded like an implausible excuse.
4 He gave a series of increasingly implausible excuses.
5 I'm not sure which is more implausible, the notion that people would ever get blasé about a 40-foot-high, formerly extinct reptile or that a theme park would try to boost its revenue in such a wildly risky way.