Related Clues:

• Uninspiring lecturers, e.g.
• Yawners
• Causes ennui
• Sedatives
• Oxycodone et al.
• Crummy dates
• They may knock you out
• Dull people
• Brings to tears?
• Brings to tears, perhaps
• Causes to yawn, perhaps
• Makes a hole
• Uses a drill
• They make you yawn
• Heroin and the like