Related Clues:

• Put in the fridge
• Level-headed
• 'Sweet!'
• Hard to fluster
• Old-fashioned ''Super!''
• Calm and relaxed
• Beatnik's 'all right'
• Beatnik's expletive
• 56, say
• ''Awesome!''
• Not nervous
• "Cool!"
• ''Peachy keen!''
• "So cool!"
• Like the proverbial cucumber