Related Clues:

• Like a good alibi
• Solid
• Hepster's exclamation
• Hard and firm
• Unwilling to budge
• Not subject to bargaining
• Financially sound
• Utterly reliable
• Like some mattresses
• John Grisham novel, with "The"
• Well-grounded
• Rocklike
• Rocky?
• Based on good judgement
• Unwilling to negotiate