Related Clues:

• Beatnik's expletive
• 56, say
• Not nervous
• Like the proverbial cucumber
• Socially adept, in slang
• 'Groovy'
• Like laid-back jazz
• Not exactly friendly
• "Sounds good"
• Close to cold
• ''___ Hand Luke''
• "Neato!"
• Not friendly
• Hep, as cats
• Quite cold