Related Clues:

• SF writer's last two characters given a lead role — surely not!
• Half the HP in Arthur's queen
• Royal Navy upset about female entry? Not at all
• Absolutely not!
• Certainly not!
• Strong negative
• Under no circumstances (as Tweedledum said)
• Exclamation of disbelief
• Today? Forever? Never!
• When Norway loses the right to vote negatively
• "Ain't gonna happen!"
• Word repeated in both James Bond and Justin Bieber film titles
• Not in any way, in dialect
• Not under any circumstances, informally
• "Over my dead body!"