Related Clues:

• Research for one that is not worth explaining
• 'It was bad, and that's all I'll say right now'
• Response to 'How bad was it?'
• *Resolving a Mafia dispute, e.g.?
• ''It's a secret!''
• 'Let's not talk about it'
• I'm not prepared to talk about academic work
• "It's not worth getting into"