unbearable [ʌnˈbeərəbl]

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adj.不能容忍的；忍受不住的

too painful or unpleasant for you to continue to experience

It is unbearable to be always on thorns. 老是处于焦虑不安的情况中是受不了的。
The more he thought of it the more unbearable it became. 他越想越觉得无法忍受。