UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ɪmˈpɑːsəbəl/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ɪmˈpæsəbəl/ ,USA pronunciation: respelling(im pasə bəl, -päsə-)

WordReference Random House Learner's Dictionary of American English © 2020
im•pass•a•ble /ɪmˈpæsəbəl/USA pronunciation   adj. 
  1. not allowing passage:Snow made the highways impassable.
See -pass1-.
WordReference Random House Unabridged Dictionary of American English © 2020
im•pass•a•ble  (im pasə bəl, -päsə-),USA pronunciation adj. 
  1. not passable;
    not allowing passage over, through, along, etc.:Heavy snow made the roads impassable.
  2. unable to be surmounted:an impassable obstacle to further negotiations.
  3. (of currency) unable to be circulated:He tore the bill in half, making it impassable.
im•pass′a•bili•ty, im•passa•ble•ness, n. 
im•passa•bly, adv. 
  • im-2 + passable 1560–70

Collins Concise English Dictionary © HarperCollins Publishers::
impassable /ɪmˈpɑːsəbəl/ adj
  1. (of terrain, roads, etc) not able to be travelled through or over

imˈpassably adv
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