Related Clues:
- Hard to stir
- Epictetus, for one
- ___ Dan (1970s band)
- Cold and hard
- Marcus Aurelius was one
- Unemotional sort
- Student of Zeno
- Not likely to flinch
- Firm and unwavering
- Constant and resolute
- Firm, fixed and faithful
- Oblivious of dangers or resolute in facing them
- Constant, not changing or yielding
- Oblivious of dangers or perils
- Ignoring danger and peril