unendurable

US /ˌʌn.ɪnˈdʊr.ə.bəl/
UK /ˌʌn.ɪnˈdʊr.ə.bəl/
1.

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If a situation or experience is unendurable, it is so unpleasant or painful that it is almost impossible to bear:

:
unendurable pain/suspense