Related Clues:

• Bloviator, often
• Arouse ennui
• Tube's inner diameter
• Was worthy of
• Tedious one
• Tiresome type
• Bring to tears?
• Make holes
• Interest-reduction cause?
• Barrel statistic
• Gun barrel stat
• Tedious sort
• Drip
• Yawn-inducing speaker, say
• What unexciting drillers do?