become stale

Did even the same succession of callers become stale and a bore, so that strangers had to be sought to provide a stimulus?

Like everything else that is true art, these stories never become stale.

Granted that the liberal movement had become stale and needed a renewal, there was nothing in that fact to create a supreme issue.

They have become stale, and by coming in contact with different kinds of material have lost their delicate flavor.

Some one remarked that "certain beauties of Mozart's music had become stale with age."