Related Clues:

• Grow tiresome
• Cover of gloom
• Get wearisome
• Lose interest
• Become ho-hum
• Become less appealing
• Where the sun doesn't shine
• Get old
• Cloud of gloom
• A sudden numbing dread
• Source of gloom
• Become unpleasant
• Cloak of gloom
• Become tedious
• Black cloud