Modifiers matching occurrence:

• natural,
• awesome,
• rare,
• medical,
• unforeseen,
• unexpected,
• dangerous,
• musical,
• odd,
• unforeseeable,
• random,
• small,
• unusual,
• unwanted,
• unplanned,
• seasonal,
• serious,
• meaningful,
• spontaneous,
• historical,
• elemental,
• catastrophic,
• exceptional,
• infrequent,
• exogenous,
• unpredictable,
• possible,
• geologic,
• common,
• unfortunate,
• sudden,
• commonplace,
• climatic,
• everyday,
• autonomic,
• interesting,
• normal,
• outdoor,
• environmental,
• acoustic,
• costly,
• negative,
• neurological,
• localised,
• single,
• irregular,
• cataclysmic,
• uncertain,
• routine,
• internal,
• major,
• positive,
• ordinary,
• benign,
• strange,
• accidental,
• motivational,
• dramatic,
• deadly,
• untoward,
• supernatural,
• unlikely,
• superficial,
• deviant,
• recent,
• neurologic,
• miscellaneous,
• cosmic,
• temporary,
• physical,
• dynamic,
• local,
• devastating,
• social,
• extraordinary,
• political,
• damaging,
• unpleasant,
• inanimate,
• disruptive,
• outside,
• specified,
• planned,
• significant,
• simple,
• operational,
• periodic,
• geographical,
• corporeal,
• tragic,
• hazardous,
• stressful,
• extreme,
• discrete,
• unavoidable,
• harmful,
• interactive,
• traumatic,
• relevant,
• terrifying,
• undesirable,
• unique,
• abnormal,
• severe,
• violent,
• future,
• adverse,
• astronomical,
• special,
• transient,
• unanticipated,
• disastrous,
• happy,
• criminal,
• annual,
• organizational,
• external,
• weather,
• seismic,

Simple categories matching unwanted:

• variable,
• plant,
• bacteria,
• pest,
• item,
• program,
• organism,
• stain,
• happening,
• energy,
• larva,
• software,
• material,
• protein,
• document,
• place,
• occurrence,
• intruder,
• germ,
• content,
• view,
• insect,
• vegetation,
• bedfellow,
• infection,
• coating,
• stuff,
• particulate,
• animal,
• fluid,
• contamination,
• substance,
• phenomenon,
• tissue,
• event,
• intermediate,
• herbivore,
• object,
• area,
• activity,
• effluent,
• caller,
• mail,
• message,
• feeder,
• souvenir,
• light,
• entity,
• pet,
• target,
• nuisance,
• space,
• particle,
• tree,
• adulterant,
• grass,
• comment,
• critter,
• papers,
• body,
• interference,
• odour,
• state,
• advertisement,
• process,
• people,
• equipment,
• shade,
• panel,
• compound,
• code,
• layer,
• noise,
• variation,
• condition,
• odor,
• molecule,
• gas,
• scavenger,
• parasite,
• volatile,
• structure,
• literature,
• game,
• thought,
• solicitation,
• surface,
• trait,
• input,
• branch,
• pollutant,
• waste,
• acid,
• advert,
• textile,
• ion,
• solute,
• behavior,
• component,
• portion,
• hardwood,
• contaminant,
• mammal,
• entrant,
• furniture,
• communication,
• fabric,
• article,
• disturbance,
• piece,
• deposit,
• chemical,
• file,
• medium,
• behaviour,
• response,
• container,
• feature,
• action,
• pesticide,
• spam,
• byproduct,
• substrate,
• effect,
• treasure,
• ingredient,
• cell,
• emotion,
• impurity,
• extra,
• thing,
• change,
• smell,
• atom,
• vermin,
• agent,
• species,
• illumination,
• instrument,
• solid,
• medication,
• situation,
• emission,
• nonsense,
• fungus,
• inhabitant,
• trace,
• microorganism,
• information,
• liquid,
• appliance,
• soil,
• blemish,
• signal,
• acceleration,
• rodent,
• part,
• matter,
• sediment,
• residue,
• fuel,
• incident,
• consequence,
• symptom,
• mineral,
• intrusion,
• artefact,
• metal,
• sound,
• reptile,
• predator,
• fish,
• yeast,
• debris,
• reaction,
• user,
• elements,
• growth,
• folder,
• conduct,
• person,
• hair,
• filler,
• email,
• motion,
• artifact,
• grub,
• creature,
• child,
• bird,
• friend,
• movement,
• microbe,
• constituent,