Modifiers matching trouble:

• unforeseen,
• unexpected,
• undesirable,
• psychological,
• sexual,
• internal,
• small,
• technical,
• economic,
• serious,
• experienced,
• mechanical,
• fatal,
• political,
• financial,
• temporary,
• real,
• everyday,
• mental,
• environmental,
• major,

Simple categories matching psychological:

• pleasure,
• state,
• process,
• characteristic,
• pressure,
• condition,
• consequence,
• activity,
• damage,
• notion,
• mechanism,
• research,
• disorder,
• aggression,
• problem,
• control,
• trouble,
• fiction,
• treatment,
• help,
• function,
• event,
• difficulty,
• aberration,
• maturity,
• reward,
• morbidity,
• impairment,
• harm,
• inquiry,
• trait,
• science,
• discomfort,
• attribute,
• exercise,
• feeling,
• error,
• component,
• crime,
• obstacle,
• complication,
• aspect,
• stage,
• teaching,
• block,
• care,
• analyst,
• adaptation,
• force,
• limitation,
• concept,
• disturbance,
• education,
• perturbation,
• manipulation,
• benefit,
• mistreatment,
• defence,
• impact,
• motivation,
• bias,
• space,
• symptom,
• emotion,
• defense,
• practice,
• abstraction,
• product,
• measurement,
• project,
• study,
• behaviour,
• system,
• evaluation,
• capability,
• drive,
• trauma,
• content,
• stress,
• ability,
• property,
• measure,
• nature,
• test,
• domain,
• reaction,
• hazard,
• principle,
• energy,
• play,
• service,
• instrument,
• attitude,
• complaint,
• intervention,
• variable,
• phenomenon,
• values,
• quality,
• resource,
• injury,
• development,
• closeness,
• procedure,
• factor,
• change,
• skill,
• pain,
• inertia,
• theory,
• ill,
• experience,
• structure,
• cause,
• demand,
• disease,
• support,
• maltreatment,
• connection,
• status,
• abnormality,
• conflict,
• harassment,
• response,
• use,
• model,
• form,
• area,
• distress,
• illness,
• issue,
• faculty,
• dimension,
• entity,
• strength,
• feature,
• tendency,
• knowledge,
• motive,
• strain,
• disposition,
• task,
• malady,
• concern,
• technique,
• method,
• perception,
• power,
• capacity,
• discipline,
• behavior,
• belief,
• work,
• ailment,
• level,
• abuse,
• terms,
• topic,
• makeup,
• situation,
• idea,
• therapy,