However, I have uncovered a somewhat implausible tale.

The arc of his character takes him from self-serving nihilism to heroic fellow-feeling, a progression that enables the movie's uplifting, somewhat implausible ending.

This somewhat implausible geography leads to the expected love triangles but also to some surprising rectangles as the town gets smaller and Melinda's desperation builds.

And also, in the end, somewhat implausible.

If so, isn't it somewhat implausible to imagine a person walking around with a "hard flame" for his entire life?

Here is an example, picked at random, of this somewhat implausible claim:

Publishers Weekly wrote that the ending of the book was "somewhat implausible" but that the overall book was "engrossing".

The first presents a somewhat implausible way to embrace change; the second imagines a downright fantastical way to avoid it.

This etymology is a somewhat implausible for a hilly location at an elevation of some 135 meters located several kilometers from the sea.

Also, the story about the psychiatrist sounds somewhat implausible.