Modifiers matching stimulus:

• external,
• special,
• adverse,
• mental,
• stressful,
• detrimental,
• sensory,
• internal,
• cytotoxic,
• familiar,
• pathologic,
• chemical,
• monotonous,
• noxious,
• transient,
• negative,
• mechanical,
• artificial,
• emotional,
• physiologic,
• unpleasant,
• cellular,
• simple,
• neutral,
• peripheral,
• aversive,
• exogenous,
• electrical,
• psychic,
• pathological,
• abnormal,
• visual,
• real,
• physiological,
• old,
• constant,
• prolonged,
• chronic,
• local,
• standard,
• innocuous,
• noninfectious,
• physical,
• environmental,
• auditory,
• strong,
• major,
• subtle,
• extraneous,
• rewarding,
• temporal,
• nonspecific,
• identifiable,
• painful,
• inflammatory,
• supplemental,
• outside,
• maternal,
• rhythmic,
• individual,
• complex,
• distinct,
• organizational,
• natural,
• distressing,
• damaging,
• stimulating,
• extracellular,
• intense,
• subjective,
• multiple,
• positive,
• biological,
• instructional,
• diverse,
• social,
• harmful,
• light,
• pictorial,
• ambient,

Simple categories matching harmful:

• practice,
• substance,
• chemical,
• caterpillar,
• addiction,
• volatile,
• action,
• contamination,
• animal,
• metal,
• fraction,
• material,
• article,
• subsidy,
• organism,
• microbe,
• state,
• therapy,
• bacteria,
• group,
• inhalant,
• thing,
• disorder,
• place,
• contaminant,
• particle,
• molecule,
• act,
• microorganism,
• compound,
• ingredient,
• food,
• preservative,
• test,
• factor,
• arachnid,
• infection,
• stimulant,
• sector,
• fauna,
• fat,
• allergen,
• herb,
• intermediate,
• yeast,
• salt,
• power,
• emission,
• condition,
• item,
• fuel,
• light,
• residual,
• fiber,
• energy,
• alkaloid,
• parasite,
• drinking,
• phenomenon,
• creature,
• danger,
• habit,
• impurity,
• bug,
• abnormality,
• deeds,
• work,
• behavior,
• program,
• cell,
• insect,
• mineral,
• choice,
• predator,
• circumstances,
• element,
• code,
• industry,
• intervention,
• pesticide,
• property,
• stuff,
• fumigant,
• symptom,
• pathology,
• radical,
• invertebrate,
• commodity,
• atmosphere,
• tool,
• service,
• emotion,
• waste,
• utterance,
• occurrence,
• virus,
• ion,
• product,
• curio,
• object,
• irradiation,
• intruder,
• stain,
• halogen,
• change,
• flavoring,
• sport,
• information,
• oxidant,
• quality,
• solute,
• cause,
• force,
• experience,
• effect,
• frequency,
• stress,
• tax,
• software,
• medication,
• content,
• complication,
• nutrient,
• conduct,
• antigen,
• fumes,
• defect,
• agent,
• idea,
• pest,
• entity,
• constituent,
• elements,
• residue,
• radiation,
• fish,
• sweetener,
• germ,
• influence,
• adulterant,
• gas,
• reactant,
• beverage,
• gene,
• pathogen,
• pollutant,
• plant,
• monomer,
• matter,
• stimulus,
• consequence,
• filler,
• environment,
• procedure,
• weeds,
• email,
• activity,
• occupation,
• aggression,
• behaviour,
• illness,
• disease,
• weather,
• event,
• problem,
• component,
• deposit,
• exposure,
• fluid,
• trait,
• situation,
• diuretic,
• drug,
• result,
• process,
• crime,
• notion,
• sediment,
• treatment,
• toxin,
• aerosol,
• liquid,
• solvent,