Related Clues:

• Bring to tears?
• Make holes
• Interest-reduction cause?
• Barrel statistic
• Gun barrel stat
• Tedious sort
• Drip
• Yawn-inducing speaker, say
• What unexciting drillers do?
• Tedious talker
• Droner, often
• Uninteresting storyteller
• Dull fellow
• Barrel's inside diameter
• Unwanted guest, maybe