Related Clues:

• 'Meh, I don't think so'
• "Not for me"
• 'I'm good'
• Dismissive reply
• 'Nope, not interested'
• "You're dreaming"
• "I'd rather not"
• Slangy denial, and a hint to 20-, 29-, 46- and 56-Across
• 'ÔFraid not'
• "Won't do it"
• 'Not gonna happen!'
• Negative response of upper-class Henry finding university hard
• Uncouple every other one? Not on your life!
• This is no secret — not keeping quiet at all, it gets around
• Negative response of number needing exercise