Intolerable vs. Untolerable: What's the Difference?

Impossible to tolerate or endure; unbearable

Not tolerable; not capable of being borne or endured.

Extremely offensive or insulting.

(nuclear power) Extremely worn and degraded, to the point of being unsafe.

Not tolerable; not capable of being borne or endured; not proper or right to be allowed; insufferable; insupportable; unbearable; as, intolerable pain; intolerable heat or cold; an intolerable burden.

Enormous.

Impossible to tolerate or endure;

Completely unacceptable;