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I'm having unbearable pain right now.
It was unbearable to watch.
The uncertainty was unbearable.
The thought of losing you is unbearable.
I think you mean unbearable. The rain was nearly unbearable after a week. His constant complaining was unbearable.
The word "unbearable" is an adjective. It describes something that is not able to be endured or tolerated.
If something is unbearable it means the organism cannot tolerate it. Very hot temperatures are unbearable for life to exist for example.