unpronounceable

/ˈʌnprəˌnaʊnsəbəl/

Definitions of unpronounceable

1. adjective

   impossible or difficult to pronounce correctly
   antonyms:

   pronounceable

   capable of being uttered or pronounced

   rolled, rolling, trilled

   uttered with a trill
2. adjective

   very difficult to pronounce correctly
   “an unpronounceable foreign word”

   synonyms: unutterable

   incommunicative, uncommunicative

   not inclined to talk or give information or express opinions