degraded

Decades of farming and irrigation have degraded the soil, drawing salts and metals to the surface.

Because the skeletons are badly degraded, the DNA extracted from them is low and of poor quality.

The Iranian-backed group was significantly degraded in last year's war with Israel but has, so far, refused to give up its arsenal, despite calls from the US and domestic rivals.

Environment Canada issued alerts for much of Ontario, warning that wildfire smoke had significantly degraded air quality.

Over decades, this relentless “grazing” of pledges, without consistent, effective follow-through, degraded the shared resource of trust down to bare earth.