Related Clues:

• Boring, colorwise
• Bor-r-r-ring
• *See 61-Across
• Not at all bright
• Like Soviet architecture
• Far from colorful
• Faded and dull
• Far from flashy
• Lacking in color
• Awfully dull
• Dull, as a color
• Fatiguing
• Dull and uninteresting
• Dull-colored, or just plain dull
• Olive shade