The difference between Fathomless and Unknowable
When used as adjectives, fathomless means very deep (especially of water deeper than a lead line can measure), whereas unknowable means not knowable.
Unknowable is also noun with the meaning: something that cannot be known.
check bellow for the other definitions of Fathomless and Unknowable
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Fathomless as an adjective:
Very deep (especially of water deeper than a lead line can measure); bottomless.
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Fathomless as an adjective (by extension):
unfathomable or incomprehensible.
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Unknowable as an adjective:
Not knowable; not able to be known.
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Unknowable as a noun:
Something that cannot be known.