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unfathomable

adjective
 
 
/ʌnˈfæð.ə.mə.bl̩/ formal

Definition

impossible to understand: For some unfathomable reason they built the toilet next to the kitchen.Difficult to understandComplicated and difficult to doPuzzle and confuse unfathomably
 
 
/-bli/ adverb formal
(Definition of unfathomable adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of unfathomable