Implausible

Sadly many people will believe things told to them via an email which they would find implausible face-to-face.

Tom came up with an implausible story.

Richa's theories can be very fascinating, even if they are implausible.

That Richa can read minds is implausible, to say the least.

A manned expedition to Mars within the next year? That's completely implausible.

Tom's story was utterly implausible, but I pretended to believe him.

What Tom said was implausible, but I pretended to believe him.

These claims are not supported by anything in the scientific literature, and also seem fairly implausible on genetic grounds.

Harper finds the idea that Latin developed into the modern Romance languages too implausible to believe.