Related Clues:

• Hep, as cats
• Quite cold
• Ducky
• 'Fantabulous!'
• Supercool
• ''Swell!''
• Nifty in the '50s
• On ice, maybe
• "That's awesome!"
• Hardly amicable
• "Works for me"
• ''Outta sight!''
• 44-Across, updated
• __ as a cucumber
• 'So cool!'