There was a false heartiness about it, a completely unconvincing effort at casualness.

That mood is shattered with the appearance of an animated cloud that turns into a completely unconvincing approximation of a tornado.

He made a glib excuse that was completely unconvincing.

Your staff explanation is completely unconvincing.

She pivoted around to face him, the smile she wore completely unconvincing.

Hal had backed off after a few completely unconvincing pleasantries, but Gabriel had stayed, waiting for a particular reaction.

But he knew that his tone was completely unconvincing.

"One to Another," the series's other exploration of wild youth, is a completely unconvincing sexual murder mystery.

We all rely on oil, and yet the 'official' oil industry data is completely unconvincing.

Theirs is a completely unconvincing relationship, which is regrettable because it is supposed to bear much of the play's emotional weight.