Related Clues:
- Showing little emotion
- Unwilling to bend
- Not easily flapped
- Unable to continue
- Betraying no emotion
- Giving nothing away, in a way
- Uncomplaining sort
- Follower of the philosopher Epictetus
- Intolerant
- Boardlike
- Having a stiff upper lip
- Not overly emotional
- At an impasse
- Not moved much
- Not reacting to pain, say