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1. That which is below standard or expectations as of ethics or decency
   - bad
    
2. Used of the degree of something undesirable e.g. pain or weather
   - severity, severeness
    
3. An attribute of mischievous children
   - naughtiness, mischievousness

Type of: disobedience, intensity, intensiveness, quality

Antonym: goodness

Encyclopedia: Badness