The transverse line is present and the discal spot hardly discernible.

This response, though faint, fleeting and hardly discernible in humans nonetheless clearly manifests itself.

When I looked back at the cell shower it was hardly discernible.

The pillar of smoke was hardly discernible except for the glowing eyes.

He shot a glance toward the Mexican, hardly discernible in the distance.

There was a faint, hardly discernible odor of old sewage.

There was a slight, hardly discernible shiver through the tower, and then something gave with a crash.

The bunker doors were hardly discernible so deft was their camouflage.

She was five miles from us, and looked like a dark mass, hardly discernible.

It's hardly discernible with the naked eye unless one is looking for it.