Related Clues:

• Forbearing
• Muted
• Detached type
• Lacking enthusiasm
• Not very enthusiastic
• Showing no pain
• Unemotional to a fault
• Indifferent to pleasure or pain
• Like Spock
• Half-hearted
• Even-keeled
• Neither hot nor cold
• One who bites the bullet
• Phlegmatic
• Bullet-biting type