The waiting room was unendurably crowded, so I stepped outside for fresh air.

The heat in the closed room became unendurable, forcing everyone to step outside.

The painter's fame was unenduring, admired for a season before being forgotten.

The unendured pain of the survivors echoed through the empty halls.

She described the unendurableness of the heat during the desert crossing, saying it tested everyone's resolve.

The unendurability of the relentless noise made concentration impossible for everyone in the office.