unfathomed

adj

1. (not-comparable)Of unknown depth.

   “Youth is not less averse from change; but that is from exaggeration of its consequences, for all seems to the young so important, and so fatal. They are timid, because they know not what they fear; hopeful, because they know not what they expect. Despite their gayety of confidence, they yet dread the first plunge into life's unfathomed deep.”

   “As she told me, I was naught to her, and never shall be through the unfathomed depths of Time, unless, indeed, conditions alter, and a day comes at last when two men may love one woman, and all three be happy in the fact.”

   ““We must follow after this dreadnought, hard on her tracks. She shall not dodge me though she hide in unfathomed waters, or in the earth's bosom, or in lonely woods, or on crags!””

2. (not-comparable)Not explored or understood.

   “Man does vvith dangerous Curioſity / Theſe unfathom'd VVonders try: / VVith fancy'd Rules and Arbitrary Lavvs / Matter and Motion he reſtrains, / And ſtudy'd Lines and fictious Circles dravvs; […]”