Related Clues:
- Hard to rattle
- Free of worry
- Even-tempered
- Conducive to meditation
- Calm and composed
- Cool as a cucumber
- Apollonian
- Calm as can be
- Calm, cool and collected
- Lake __, 1980 Winter Olympics town
- Anxiety-free
- Not easily excited
- Calm and unruffled, like a princely title.
- Peaceful and calm
- Calm and tranquil