Related Clues:
- They're frowned upon
- Cake and ice cream, to dieters
- They're not allowed
- Running with scissors and others
- Pitchers' hitless games, in baseball slang
- They shouldn't be done
- Discouraged behaviors
- Plagiarism and such
- Thou-shalt-nots
- Half an etiquette list
- Verboten things
- Spooky quality
- Things that shouldn't be done
- They're unacceptable
- Off-limits acts