insupportable

/ˌɪnsəˈpɔrtəbəl/
adjective
  1. So unpleasant, painful, or difficult that it cannot be tolerated or endured.
    • She found his constant complaining insupportable after a while.
    • The heat in the small room was insupportable, and everyone had to leave.
    • The loss of her best friend was an insupportable grief.
Antonyms