Related Clues:

• Inflexible
• Harsh
• Exacting
• Severe
• Austere
• Unsparing
• Thoroughgoing
• Harsh or severe
• Disciplined
• Painstakingly careful and accurate
• Strict and severe
• Demanding and stern
• Sour Igor being most severe
• Strict as discipline may be
• Allowing no deviation from a standard