unfathomable

Etymology

un- + fathom + -able.

adj

  1. Impossible to fathom or understand.
    The sheer numbers they attacked with were unfathomable.
    Suggestions that those leaders are irrational and their decisions unfathomable are remarkably shallow. North Korea is not a theocracy led by zealots who preach the rewards of the afterlife. April 9, 2013, Andrei Lankov, “Stay Cool. Call North Korea’s Bluff.”, in New York Times
  2. Difficult to penetrate.

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