unbearable, intolerable
The smell was unbearable.
You are unbearable.
Tu es simplement insupportable !
You're simply unbearable!
Cette chaleur est insupportable.
This heat is unbearable.
La douleur était quasiment insupportable.
The pain was almost unbearable.
L'idée de ne plus la voir m'est insupportable.
The thought of never seeing her again is unbearable to me.