Related Clues:

• Not very bright, really
• Pessimistic
• Cloudy
• Indistinct
• Lacking luster
• Like a day in Houston, often
• Lusterless
• Hopeless
• None too swift
• One of the three H's in a summer weather forecast
• Lacking brightness
• Grow faint
• Blurred
• Not quite Mensa material
• Lower the lights