Related Clues:

• Stone-faced
• Hard to move
• Indifferent
• Lettuce variety
• Unfeeling
• Big chunk of the Atlantic?
• Unaffected by passion
• Aloof sort
• Showing no emotion
• Shipping hazard
• Lettuce type
• Floating mass of frozen water
• Unflappable
• Follower of Zeno
• Renewable freshwater resource