Related Clues:

• Really cool
• Swell, slangily
• Partner of calm and collected
• Unenthusiastic
• Obsessed, in a way
• In fashion, slangily
• Peachy follower?
• Highly sharpened
• Acute, as vision
• Fantastic, in Beatlemania
• Fashionable, informally
• Like an eagle's eye
• The -- Four
• "The ___ Four" (The Beatles)
• Loftily unengaged