Modifiers matching challenge:

• global,
• systemic,
• societal,
• ongoing,
• organizational,
• major,
• social,
• operational,
• unfamiliar,
• musical,
• key,
• developmental,
• technical,
• political,
• complicated,
• professional,
• severe,
• world,
• behavioral,
• big,
• serious,
• local,
• broad,
• physical,
• special,
• new,
• basic,
• mental,
• internal,
• interpersonal,
• legal,
• individual,
• unexpected,
• structural,
• extra,
• economic,
• personal,
• regional,
• environmental,
• minor,
• national,
• several,
• international,
• educational,
• common,
• everyday,
• complex,
• administrative,
• phonological,
• technological,
• future,
• healthy,
• immune,
• urban,

Simple categories matching serious:

• violence,
• effort,
• operation,
• illness,
• disease,
• piece,
• help,
• storm,
• crime,
• title,
• infection,
• profession,
• condition,
• pathology,
• upheaval,
• occurrence,
• bacteria,
• reaction,
• assault,
• misdeed,
• conduct,
• development,
• procedure,
• offense,
• virus,
• offence,
• failure,
• enterprise,
• injury,
• matter,
• end,
• disorder,
• setback,
• risk,
• enjoyment,
• cancer,
• experience,
• infringement,
• stimulant,
• arrhythmia,
• harassment,
• behaviour,
• transgression,
• entity,
• drama,
• case,
• violation,
• sector,
• status,
• work,
• phenomenon,
• delinquent,
• material,
• idea,
• measure,
• abnormality,
• abuse,
• diversion,
• information,
• pains,
• defect,
• discipline,
• content,
• music,
• state,
• drug,
• imperfection,
• surgery,
• sanction,
• theme,
• forum,
• trouble,
• system,
• malignancy,
• pathogen,
• headache,
• circumstances,
• charge,
• wound,
• science,
• flaw,
• attack,
• trait,
• misconduct,
• study,
• damage,
• harm,
• journal,
• promise,
• contagion,
• misbehaviour,
• passion,
• allergy,
• challenge,
• item,
• sickness,
• reader,
• point,
• form,
• mistake,
• incident,
• dance,
• consequence,
• event,
• cause,
• tumour,
• weapon,
• subject,
• malady,
• need,
• disruption,
• disability,
• calamity,
• accident,
• problem,
• blemish,
• user,
• disturbance,
• conflict,
• ailment,
• manifestation,
• program,
• substance,
• loss,
• result,
• infraction,
• agent,
• document,
• ceremony,
• attempt,
• behavior,
• situation,
• grounds,
• handicap,
• works,
• topic,
• interaction,
• hazard,
• larceny,
• business,
• intervention,
• happening,
• penalty,
• complication,
• difficulty,
• zoonosis,
• occasion,
• threat,
• stuff,
• aberration,
• constraint,
• morbidity,
• error,
• casualty,
• participation,
• application,
• malfunction,
• symptom,
• act,
• wrongdoing,
• activity,
• std,
• gathering,
• stage,
• felony,
• action,
• complaint,
• animal,
• professional,
• addiction,
• game,
• evil,
• malpractice,
• danger,
• disaster,
• story,
• tale,
• trauma,
• pain,
• song,
• tendency,
• writing,
• emotion,
• indiscipline,
• mishap,
• thing,
• phobia,
• nature,
• issue,
• endeavor,
• injustice,
• scholar,
• narcotic,
• sin,
• misfortune,