Etymology
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unfathomable (adj.)

1610s, originally in the figurative sense, of feelings, conditions, etc., from un- (1) "not" + fathomable. Literal sense attested from 1670s. Related: Unfathomably.

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Definitions of unfathomable

unfathomable (adj.)
of depth; not capable of being sounded or measured;
unfathomable (adj.)
resembling an abyss in depth; so deep as to be unmeasurable;
Synonyms: abysmal / abyssal
unfathomable (adj.)
incapable of being fully understood;
From wordnet.princeton.edu