UNPRONOUNCEABLE
Meaning of UNPRONOUNCEABLE in English
un ‧ pro ‧ nounce ‧ a ‧ ble /ˌʌnprəˈnaʊnsəb ə l◂/ BrE AmE adjective
an unpronounceable word or name is very difficult to say
Longman Dictionary of Contemporary English.
Longman - Словарь современного английского языка.
2012