Etymology
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unfathomed (adj.)

1620s, from un- (1) "not" + past participle of fathom (v.).

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Definitions of unfathomed

unfathomed (adj.)
situated at or extending to great depth; too deep to have been sounded or plumbed; "the dark unfathomed caves of ocean"-Thomas Gray;
Synonyms: profound / unplumbed / unsounded
From wordnet.princeton.edu