Related Clues:

• Like some angles
• Not sharp
• Short on sharpness
• Blockheaded
• Dim
• Like osmium, more than any other known element
• Hard to penetrate
• Crammed
• Needs another way?
• Concentrated
• None too swift
• Hardly suited for Mensa
• Insensitive
• Greater than 90 degrees
• Slow to understand