Related Clues:

• Far from emotional
• Very cool
• Displaying no emotion
• Mired
• Immovable
• Imperturbable
• Poker-faced
• Hard to get to
• Solemn ceremony
• Unflinching
• Stiff as a board
• Hung-up
• Bite-the-bullet type
• Far from demonstrative
• Nuts about, with "on"