fathomless

a man of fathomless energy

The ocean is fathomless in its depths.

Her eyes held a fathomless sadness.

The universe is filled with fathomless mysteries.

His knowledge on the subject seemed fathomless.

The artist's creativity was fathomless.

The old library contained fathomless wisdom.

The complexity of the issue was fathomless.

In his eyes, there was a fathomless depth of emotion.

The fathomless darkness of the cave was unsettling.

The professor's knowledge was fathomless.