not fresh; vapid or flat, as beverages; dry or hardened, as bread. musty; stagnant: stale air. having lost novelty or interest; hackneyed; trite: a stale joke.

What does it mean to go stale?

Definition of go stale 1 of a food : to become no longer fresh The bread went stale. 2 : to become dull or predictable Their relationship went stale.

What do you understand by nonchalantly?

Definition of nonchalantly : in a nonchalant manner : in a casual way that shows a relaxed lack of concern or interest She nonchalantly glanced our way. He walked nonchalantly to his seat.