Related Clues:

• Indistinct
• Lacking luster
• Lusterless
• Teary-eyed
• Hopeless
• None too swift
• Like the air around Niagara Falls
• Lacking brightness
• Grow faint
• Blurred
• Like some opals
• Not quite Mensa material
• Lower the lights
• Bubbleheaded
• Darken