Insupportable (adjective)

1. Not able to be endured, sustained, or supported.
2. Not capable of being maintained or continued.

Origin:

Late 16th century: from french, from in- 'not' + supportable, from soutenir 'to support'. the current sense of the word dates from the late 16th century.

Examples:

1. The insupportable conditions in the refugee camp led to widespread illness.
2. The insupportable weight of the load caused the bridge to collapse.
3. The insupportable stress of the job eventually led to burnout.
4. The insupportable demands of the job were beyond her capacity.
5. Insupportable financial losses eventually led to the company's bankruptcy.