The phonetic transcription of "insurmountable" is /ˌɪnsəˈmaʊntəbl/ in British English and /ˌɪnsərˈmaʊntəbl/ in American English. Click the 🔊 button to hear both pronunciations.
Synonyms for "insurmountable": impossible, hopeless, overwhelming.
Example usage of "insurmountable": "The task seemed insurmountable at first, but we managed.". More examples on the page.