Simple categories matching improper:

• activity,
• material,
• content,
• use,
• conduct,
• action,
• location,
• behavior,
• behaviour,
• practice,
• purpose,
• influence,
• motive,

Members with property improper:

• horseplay,
• theft,
• action,
• fraud,
• abuse,
• gender_discrimination,
• perjury,
• strike,
• undue_delay,
• bullying,
• sexual_harassment,
• promise,
• indecent_exposure,
• racketeering,
• insider_trading,
• bribery,
• bribery_attempt,
• blatant_embezzlement,
• market,
• willful_conduct,
• oil,
• account,
• wood,
• suspension,
• vandalism,
• cohesive_soil,
• illegal_activity,
• sexual_misconduct,
• misconduct,
• expulsion,
• storage,
• hiding,
• misuse,
• abrasive,
• intimidation,
• superstition,
• academic_dishonesty,
• bias,
• market_timing,
• burning,
• racial_discrimination,
• coercion,
• edge_loading,
• delay,
• negligence,
• skateboarding,
• abrasive_confrontation,
• place,
• late_trading,
• adult_material,
• economic_development,
• plagiarism,
• drug_use,
• unauthorized_use,
• fat,
• timidity,
• political_affiliation,
• improper_billings,
• sexual_immorality,
• vegetation_destruction,
• fabrication,
• late_trade,
• smoking,
• referral,
• reverse_charge,
• dishonesty,
• embezzlement,
• assault,
• race,
• frivolous_purpose,
• duress,
• discovery_abuse,
• infringement,
• forum_shopping,
• chair,
• revenge,
• substandard_performance,
• tallow,
• drunkenness,
• bad_faith,
• ascii_art,
• sexual_discrimination,
• unreasonable_damage,
• harassment,
• insubordination,
• collusion,
• anger_display,
• grease,
• rag,
• accepting_gift,
• contract,
• argumentative_attitude,
• collection,
• corrugated_metal,
• foreign_donation,
• racial_hostility,
• waste,
• rationing_care,
• pornography,
• fighting,
• sexual_offence,
• transfer,
• partiality,
• possession,
• dish,
• discrimination,
• violation,
• fight,
• political_surveillance,
• neglect,
• threat,
• aggression,
• misappropriation,
• coaching,
• commercial_utilisation,
• web_activity,
• falsification,
• crash_damage,
• intellectual_overexertion,
• unwarranted_discipline,
• cross_loading,
• racial_bias,
• hazardous_waste,
• trip,
• retaliation,
• damage,