1. no longer fresh; having lost its original quality due to age or exposure
2. lacking originality or interest; overused or boring

1. to become stale or cause to become stale

Examples

• The bread became stale after sitting out for three days.
• She threw away the stale cookies that had been in the jar too long.
• His jokes felt stale after hearing them so many times.
• The movie’s plot was stale and predictable.
• The air in the closed room smelled stale.
• Don’t let the crackers stale in the open package.
• Her performance had grown stale from repetition.