unfathomed

adjective
un·​fathomed | \ ¦ən+\

Definition of unfathomed

1 : not fathomed : unsounded the dark unfathomed caves of ocean— Thomas Gray
2 : undetermined, immense the thought of the unfathomed might of man— J. J. Chapman

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History and Etymology for unfathomed

un- entry 1 + fathomed, past participle of fathom

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