Related Clues:

• 'Not interested'
• Work in Northumberland? Emphatically not!
• 'Skip it'
• 'Ain't happenin''
• 'That's not true!'
• 'I don't reckon'
• "Not happenin'"
• ''Ain't gonna happen''
• "Nah"
• "I'm good"
• Disapproving remark
• Casual refusal ... and, another way, a hint to this puzzle's four longest answers
• 'That ain't gonna work'
• "Nah, I don't think so"
• 'Nuh-uh!'