Related Clues:

• Uninclined to complain
• Unresponsive?
• One involved in outrageous cost was philosophical
• Vulcan in demeanor
• Unemotive
• Unlikely to come unglued
• Hardboiled
• Unflinching in the face of pain, say
• Titanic sinker
• Hard to startle
• I see, as you say, bird flying over calf, perhaps
• An indifferent philosopher
• Floating sea hazard
• Floating piece from glacier
• Not terminally ill, about to become indifferent to pain