UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˌɪmpəˈmɪsɪbəl/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˌɪmpɚˈmɪsəbəl/ ,USA pronunciation: respelling(im′pər misə bəl)

WordReference Random House Learner's Dictionary of American English © 2020
im•per•mis•si•ble /ˌɪmpɚˈmɪsəbəl/USA pronunciation   adj. 
  1. not permissible:impermissible crimes.
See -mis-.
WordReference Random House Unabridged Dictionary of American English © 2020
im•per•mis•si•ble  (im′pər misə bəl),USA pronunciation adj. 
  1. not permissible or allowable;
im′per•mis′si•bili•ty, n. 
  • im-2 + permissible 1855–60

Collins Concise English Dictionary © HarperCollins Publishers::
impermissible /ˌɪmpəˈmɪsɪbəl/ adj
  1. not permissible; not allowed

ˌimperˌmissiˈbility n

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