IPA: /ʌnˈbɛrəbl/
KK: /ʌnˈbɛrəbəl/
Something that is too difficult or painful to endure or tolerate.
The pain from the injury was unbearable, making it hard for him to concentrate.
Unbearable → It is formed from "un-" (meaning not) and "bear" (from Old English "beran", meaning to carry or endure) and "-able" (meaning capable of). The word "unbearable" means not capable of being endured or carried.
Think of something that is 'not' ('un-') able to be 'endured' ('bear') — that's why we call it unbearable.