Crossword Genius

Unfathomable (10)

Ross

I believe the answer is:

bottomless

'unfathomable' is the definition.
(similar in meaning)

This is the entire clue.

(Other definitions for bottomless that I've seen before include "Very deep" , "Quince thus was in a jam" , "Inexhaustible" , "Having no limits" , "never getting used up?" .)

I've seen this clue in the Sydney Morning Herald.
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