Related Clues:

• Fudge, to a dieter
• ''The Sweetest ___'' (Sade hit)
• Thing we don't do
• Cake, on Atkins
• That which is not done
• Unwise act
• Something not done
• Double denial
• Thing to avoid
• Burping in public, e.g.
• Ill-advised move
• Off-limits act
• It just isn't done
• Strictly verboten
• Non-starter