An insufferable person or thing is one that's extremely annoying or unbearable. You might think someone with really bad manners is insufferable.
When we say something or someone is insufferable, we usually mean they're pushing our patience too far. Imagine having a friend who constantly complains about everything and never listens to you – you might find them insufferable after a while. The same goes for being stuck in a crowded place with bad air conditioning during rush hour – it's probably insufferable. It's like, okay, I get it, but can't things just be a bit more pleasant?
Not sufferable; very difficult or impossible to endure; intolerable, unbearable.
