Related Clues:

• 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
• Seneca, for one
• Lodged
• Unemotional thinker
• Devoid of emotion
• Hard to rattle