|Origin:||Probably from Old French estale 'standing still, settled', from estal 'standing place'|
bread or cake that is stale is no longer fresh or good to eat [≠ fresh]:
French bread goes stale (=becomes stale) very quickly.
air that is stale is not fresh or pleasant [≠ fresh]:
the smell of stale smoke
not interesting or exciting any more:
Other marriages might go stale, but not theirs.
if you get stale, you have no new ideas, interest, or energy, because you have been doing the same thing for too long:
If you stay in the job for more than 10 years, you get stale.
He was becoming stale and running out of ideas.
—staleness noun [uncountable]