—adj. 1. not fresh; vapid or flat, as beverages; dry or hardened, as bread.
2. musty; stagnant: stale air. 3. having lost novelty or interest; hackneyed; trite: a stale joke. 4. having lost freshness, vigor, quick intelligence, initiative, or the like, as from overstrain, boredom, or surfeit: He had grown stale on the job and needed a long vacation. 5. Law.having lost force or effectiveness through absence of action, as a claim.
—v.t., v.i. to make or become stale.
Pronunciation: (stāl),[key] —v.i.,staled, stal•ing. (of livestock, esp. horses) to urinate.