Related Clues:
- Hard to rattle
- Even-tempered
- Calm, ___ and collected
- Slangy-but-enduring term of approval
- Less than chilly
- "Sounds great"
- Partner of calm and collected
- Unenthusiastic
- In fashion, slangily
- Icy sensation
- Fashionable, informally
- Put in the refrigerator
- Loftily unengaged
- See 25 Down
- Relax, slangily, with 'out'