unfathomed's Usage Examples:

"Pray tell me anything new that has happened to a man anywhere on this globe"--and he reads it over his coffee and rolls, that a man has had his eyes gouged out this morning on the Wachito River; never dreaming the while that he lives in the dark unfathomed mammoth cave of this world, and has but the rudiment of an eye himself.

At the same time that we are earnest to explore and learn all things, we require that all things be mysterious and unexplorable, that land and sea be infinitely wild, unsurveyed and unfathomed by us because unfathomable.

Synonyms:

profound, unsounded, unplumbed, deep,

Antonyms:

high, natural elevation, explicable, fathomable, shallow,