Related Clues:

• "Keen!"
• ''That's swell!''
• "The ___ Four" (The Beatles)
• 'Fab!'
• Wonderful, in slang
• Like a '60s foursome
• Marv
• The ___ Four
• Old-style "Cool!"
• 'Spiffy!'
• "Spiffy!"
• Uncool 'cool'
• Super, in the '60s
• Uncool "Cool!"
• Morvan of Milli Vanilli (i.e., the one who's still alive)