unbearable
If you describe something as unbearable, you mean that it is so unpleasant, painful, or upsetting that you feel unable to accept it or deal with it. adj
(=intolerable)
War has made life almost unbearable for the civilians remaining in the capital..., I was in terrible, unbearable pain.
♦
unbearably adv usu ADV adj/-ed
By the evening it had become unbearably hot.
Translation English - Cobuild Collins Dictionary  

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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"