Related Clues:

• Terse negative
• 'Meh, I don't think so'
• "You're dreaming"
• Slangy denial, and a hint to 20-, 29-, 46- and 56-Across
• "Not a chance"
• '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
• Lack of exercise? Not on your life!
• 'Fuhgeddaboudit'
• ''You're mistaken''