Meaning of FATHOMLESS in English

FATHOMLESS

Something that is ~ cannot be measured or understood because it gives the impression of being very deep, mysterious, or complicated.

...the ~ space of the universe...

The silence was ~ and overwhelming.

ADJ

Collins COBUILD.      Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) .