INSUFFERABLE (adjective) definition and synonyms | Macmillan Dictionary.

What type of word is insufferable?

Not sufferable; difficult or impossible to endure.

What does insufferable mean in a sentence?

If you say that someone or something is insufferable, you are emphasizing that they are very unpleasant or annoying. [formal, emphasis] He was an insufferable bore. Synonyms: unbearable, impossible, intolerable, dreadful More Synonyms of insufferable.