The bread is stale and hard.
No longer fresh or good to eat; spoiled.
The milk has gone stale.
These cookies taste stale.
I don't want to eat stale chips.
stale bread
stale air
stale snacks
spoiled
rotten
decayed
His jokes are getting stale and boring.
Lacking originality or freshness; dull.
The air in the room began to stale after hours of no ventilation.
To make something stale or to become stale.
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