Related Clues:

• Uncool ones
• Hardly engages
• Causes to yawn
• Party poopers
• Uninspiring lecturers, e.g.
• Yawners
• Causes ennui
• Crummy dates
• Dull people
• Brings to tears?
• Brings to tears, perhaps
• Causes to yawn, perhaps
• Makes a hole
• Uses a drill
• They make you yawn