Related Clues:

• One causing ennui
• Drill holes
• Make weary by being dull
• Yawn producer, perhaps
• Make weary
• Yawn-inducing speaker, e.g.
• Dull person
• Tidal flood
• One who's easier to pray for than to visit, according to C. S. Lewis
• Ho-hum sort
• Make a tunnel
• One who talks only about himself, say
• Make a hole
• It can be popped
• Tiresome person