unfathomed adjective2 •Of unknown depth.“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!” — 1961 •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; […] — 1688
