Related Clues:

• In the 40's, say
• Put in the fridge
• Level-headed
• 'Sweet!'
• Hard to fluster
• Calm and relaxed
• Cat's assent
• Beatles descriptor
• Beatnik's 'all right'
• -- Four (Beatles)
• Beatnik's expletive
• 56, say
• Not nervous
• "Cool!"
• Part of a 'Queer Eye' sobriquet