The scientist proposed a decayless model of the particle that could persist indefinitely.

Scientists were fascinated by the decaylessness of the newly discovered material, which seemed to defy all known laws of deterioration.

Scientists measured the decayability of the material to predict how it would behave in landfill conditions.

The mansion's decayedness was evident in the sagging rafters and moss-covered walls.

Every monument decayeth in time under the weight of neglect.

Left in the damp cellar, the apples were quickly ruined by the decayer that fed on their skins and cores.