Related Clues:

• Not complaining
• Detached type
• Hard to read, in a way
• Showing no pain
• Unemotional to a fault
• Indifferent to pleasure or pain
• Like Spock
• Even-keeled
• One who bites the bullet
• Phlegmatic
• Bullet-biting type
• One who never cries 'Ow!'
• Immovable type
• Undemonstrative to the max
• Dispassionate person