Unendurable (adjective)

1. Not able to be endured; insufferable, unbearable, intolerable.
2. Not able to be sustained or tolerated; too severe, extreme, or difficult to withstand.

Origin:

Derived from the prefix 'un-' meaning 'not' + endurable, which is derived from the latin word 'endurare' meaning 'to endure'.

Examples:

1. The pain he felt after his accident was unendurable, and he could barely stand the thought of having to endure it for much longer.
2. The heat in the desert was unendurable, with temperatures soaring well above 100°F, making it nearly impossible to do anything other than seek shade and rest.
3. The conditions in the refugee camp were unendurable, with limited food, water, and medical supplies, and a constant threat of violence and disease.
4. The pressure from her boss to meet unrealistic deadlines was unendurable, and she eventually quit her job, unable to tolerate the stress and workload any longer.
5. The traffic on the highway was unendurable, with miles of cars backed up for hours, making what should have been a short trip into a long and frustrating journey.