Related Clues:

• Infrangible
• Hard-nosed
• Not flexible
• Stiff as a board
• Not limp
• Firmly fixed
• Unforgiving
• Unwilling to bend
• Intolerant
• Boardlike
• Unwilling to compromise
• Stiff, inflexible
• Stiff, unbending
• Stiff and inflexible
• Stiff work for the spade back at the end