Related Clues:

• Occurrence at many a lecture
• Show ennui
• Bedtime indicator
• Betray boredom
• Real drag
• Demonstrate boredom, perhaps
• Act sleepy
• Reaction to an unexciting speaker
• Look bored
• 'How boring!'
• It becomes rude if you don't use your hand
• Boredom indicator
• Display boredom, in a way
• Boring event
• Bored response