His dark eyes were fathomless in the moonlight.
He fell into the fathomless abyss.
The soulless, ancient intelligence there was as fathomless as the night sky.
Wollen ist Ursein (will is primal being); and to this alone apply the predicates fathomless, eternal, independent of time, self-affirming."
Victorian thinkers called it the ' great chasm ' or the ' fathomless abyss ' .