Insupportable is "unbearable" in English. Vous êtes insupportable is "one can hardly bears you"

Fortunately, the pain subsided or it might have become insupportable.

Incapable of being suffered, borne, or endured; insupportable; unendurable; intolerable; as, insufferable heat, cold, or pain; insufferable wrongs., Offensive beyond endurance; detestable.

Credit cards are essentially a tool. The usefulness or otherwise is not inherent in the tool but in the user and the purpose to which it is applied.

A card is useful in that less cash needs to be carried but if used unwisely insupportable debts may be incurred.

An insupportable belief that gold has some intrinsic value other than just being a metal ore that's very heavy. Once we run out of oil, all people may start to question its true worth and that will cause an end to the global economic structure as we know it.