Modifiers matching stimulus:

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

Simple categories matching exogenous:

• agent,
• particle,
• substance,
• protease,
• inhibitor,
• event,
• cytokine,
• acceptor,
• disturbance,
• catecholamine,
• solute,
• substrate,
• issue,
• change,
• compound,
• intoxicant,
• phosphoprotein,
• proteinase,
• ligand,
• variable,
• sugar,
• input,
• material,
• shock,
• buffer,
• glucocorticoid,
• metal,
• carcinogen,
• factor,
• occurrence,
• demand,
• cause,
• contaminant,
• antigen,
• pathogen,
• base,
• component,
• opsonin,
• amphetamine,
• development,
• macromolecule,
• food,
• inducer,
• dna,
• condition,
• phenomenon,
• toxin,
• activator,
• force,
• enzyme,
• system,
• carbohydrate,
• molecule,
• stimulus,
• chemical,
• acid,
• hexose,
• steroid,
• poison,
• hormone,
• opiate,
• corticosteroid,
• alteration,
• polysaccharide,
• authority,
• asthma,
• protein,
• sterol,
• control,
• source,
• amine,
• estrogen,
• antioxidant,
• retrovirus,
• precursor,
• toxicant,
• signal,
• cofactor,
• drug,
• stimulant,
• process,