IPA: /ʌnˈɛndjʊrəbəl/
KK: /ʌnˈɛndʊrəbəl/
The state of being impossible to bear or tolerate.
The unendurableness of the pain made it difficult for her to focus on anything else.
Unendurableness → It is formed from "un-" (meaning not), "endurable" (from Latin "durabilis", meaning able to last or endure), and "-ness" (meaning the state of being). The word describes the state of being not able to endure or bear something.
Think of 'not' ('un-') being combined with 'able to endure' ('endurable') and the 'state of being' ('-ness') — this helps you remember that 'unendurableness' means the state of being unable to bear something.