Related Clues:

• One who bites the bullet
• Phlegmatic
• Bullet-biting type
• One who never cries 'Ow!'
• Immovable type
• Undemonstrative to the max
• Dispassionate person
• North Atlantic hazard
• Seneca, for one
• Unemotional thinker
• Devoid of emotion
• Hard to rattle
• Arctic chunk
• Showing little emotion
• Not easily flapped