Sentence examples similar to unsound rationale from inspiring English sources

Perhaps the underlying rationale is unsound?

The rationale for this is fundamentally unsound, as I and many others have pointed out, and basically treats ISPs as if they are providing the services actually provided by the likes of Google and Facebook.

His mind's unsound.

Full schedule: unsound.pl.pl

The foundations were unsound.

But the theory is unsound.

The objection is clearly unsound.

It is unsound.

My rationale?

All are muddled, unsound, fantastic.

But was it really unsound?