Related Clues:

• Emotionally distant
• Far from genial
• Not hot
• Like Spock
• Like liquid nitrogen
• Far from friendly
• Hardly welcoming
• Not merely aloof
• Even-keeled
• Ringed with rime
• Lacking compassion
• One who bites the bullet
• Phlegmatic
• Bullet-biting type
• One who never cries 'Ow!'