Related Clues:

• Like a scrubbed space mission
• Canceled, to 69-Across
• 'Not gonna happen'
• Casual "I'll pass"
• Scrubbed, NASA-style
• "Um, no thanks"
• Opposite of 49-Across
• Slangy "No way"
• Opposite of "yep"
• "Not happening!"
• "Sorry, can't"
• "It's a ___" ("It's been canceled")
• 'Uh-unh'
• "Forget about it"
• "Nothing doing"