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fathomless

adjective (MYSTERIOUS)
 
 
/ˈfæð.əm.ləs/ literary

Definition

impossible to understand: I'm afraid it's a fathomless mystery.Difficult to understandComplicated and difficult to doPuzzle and confuse
(Definition of fathomless adjective (MYSTERIOUS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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