Related Clues:
- Unlikely to come unglued
- Hardboiled
- Like a cold stare
- Unflinching in the face of pain, say
- Common complaint caught by the elderly
- Hard to startle
- Could you leave when it's not warm
- Common complaint
- Full of frost
- An indifferent philosopher
- Not terminally ill, about to become indifferent to pain
- Very cold, unfriendly
- Aim relating to external phenomena
- Common ailment caught by the elderly
- Long-suffering type; follower of Zeno