Modifiers matching imperfection:

• under,
• little,
• minor,
• microscopic,
• cosmetic,
• serious,
• geometrical,
• small,
• structural,
• crystalline,
• morphological,
• opaque,
• technical,
• static,
• optical,
• significant,
• stubborn,
• planar,
• large,
• exterior,
• natural,
• interfacial,
• visual,
• internal,
• spatial,
• physical,
• abstract,
• layer,
• out,
• mechanical,
• isolated,
• atomic,
• facial,
• major,
• visible,
• analog,
• institutional,
• superficial,
• macro,
• dissimilar,
• subsurface,
• external,
• local,
• dermatological,
• geometric,
• localized,

Simple categories matching serious:

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