Related Clues:

• Tough; rigid
• Strong-willed like Pinocchio?
• Solid, firm
• Solid; difficult
• Penniless, working in dump
• Solid; tough
• Far from tender vegetable's not cold
• Tough don's crushed in race with Democrat
• Second prize made of marble?
• Cold, unfeeling
• Writer, not an unknown, is impenetrable
• Not squishy
• It's hard to get on in a beastly place
• Rock-strewn
• Being deceived outright is tough