czerstwy in English:

stale bread/cake/biscuits

Cake goes stale quickly if it's not covered.

While on a mountain trip, I was chewing on some hard, stale bread when I happened upon a huge snake.

Self-actualizing people have the wonderful capacity to appreciate again and again, freshly and naively, the basic goods of life, with awe, pleasure, wonder and even ecstasy, however stale these experiences may have become to others

your air, getting all of the stale air out of your body, then the inhale

bread or cake that is stale is no longer fresh or good to eat

The only thing I have to eat is some stale bread.

Is your sandwich stale, too?' 'No, it's fine.'

Ceny stale rosły przez ostatnie 10 lat.

My grandma's bread is stale, even though she baked it only yesterday.

Throw away that stale bread.

The stale smell of sweaty bodies.

It turned out the hotel restaurant had served stale bread.

What is the problem with stale air in the classroom, and how can one cure it?

A nurse brought me some bread and coffee, but the bread was stale and the coffee tasted of soap.