Related Clues:

• Like a tough cookie?
• Like dated food
• Like day-old donuts
• Hard, as bread
• Like old jokes
• Flat, as cola
• Stuffy, as air
• Lacking originality
• In need of an update
• No longer interesting
• Like old pretzels
• Well past the sell-by date
• Like days-old bread
• Like many a crossword clue for the word OREO, or like old Oreos
• Unfresh