American English

Definition of unfathomable adjective from the Oxford Advanced American Dictionary

     

    unfathomable

     adjective
    adjective
    NAmE//ʌnˈfæðəməbl//
     
    (formal)
     
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  1. 1too strange or difficult to be understood an unfathomable mystery
  2. 2if someone has an unfathomable expression, it is impossible to know what they are thinking
See the Oxford Advanced Learner's Dictionary entry: unfathomable