A gigantic gargoyle-faced man was naked, save for a clout, his bronzed body glistening in the dim illumination that came from no discernible source.

His food came on a tray shoved through a hinged flap at the bottom of the iron door, a furtive delivery that lacked any discernible source.

There was a cheery light, though from no discernible source.

Many of the verified X-ray locations still do not have readily discernible sources.

An energy-intensive technological white elephant with no discernible source of power?

No discernible source.

His depth perception was useless, for there were no shadings, and no discernible light sources to use as a guide.

In astronomy, background noise or cosmic background radiation is electromagnetic radiation from the sky with no discernible source.

"Things invisible to see" and the knowledge she had from no discernible source were something she used but didn't bandy about.

After this date he has no discernible source.