implausible

If a story sounds like it came straight from a fantasy novel—full of impossible events and unbelievable twists—then it's implausible. Think about a claim that someone flew to the moon using only balloons. That's pretty implausible!

The word comes from "plausible," meaning believable, so the prefix "im-" simply means "not." An implausible excuse is one that no one would accept as true. It's more than just unlikely; it stretches belief to its breaking point. You might describe a plot twist in a movie as implausible if it feels forced or doesn't fit with the established rules of the story.

Implausible describes something that is so lacking in credibility or so inconsistent with reason or known facts that it's highly unlikely to be true or possible. It goes beyond simply being improbable; an implausible claim actively defies belief. For example: "His explanation for being late—a sudden alien abduction—was utterly implausible."

You'll often encounter implausible when discussing stories, theories, or explanations. A detective might dismiss a suspect's alibi as implausible if it contains too many holes and contradictions. A scientist would reject an experiment's results if they were based on implausible assumptions.

While something can be improbable (meaning unlikely but still within the realm of possibility), implausible suggests a problem with the logic, details, or evidence. It's not just that something might not happen; it's that it doesn't seem realistic or convincing given what we know about the world.

Think of it this way: if you hear someone claim they won the lottery three times in a row, that's implausible. If you hear someone say they might win the lottery someday, that's just improbable.