implausible

This term describes a scenario or claim that fails the test of common sense or logical probability. It carries a stronger sense of skepticism than "unlikely," often suggesting that the story is so far-fetched that it is actively rejected as a possibility. It is frequently used in legal, journalistic, or investigative contexts to describe testimonies or excuses that lack credibility.

While "implausible" focuses on the lack of believability based on evidence or logic, it differs from "impossible," which denotes a total lack of potential for occurrence. A story can be implausible yet still technically possible, though it remains difficult for a rational observer to accept.