Modifiers matching occurrence:

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

Simple categories matching sudden:

• setback,
• event,
• move,
• symptom,
• change,
• epidemic,
• episode,
• process,
• feeling,
• turbulence,
• death,
• emergency,
• noise,
• emotion,
• light,
• injury,
• incident,
• reversal,
• situation,
• motion,
• force,
• occurrence,
• transformation,
• misfortune,
• condition,
• catastrophe,
• movement,
• disturbance,
• calamity,
• illness,
• weather,
• tragedy,
• disaster,
• sound,
• infection,
• trauma,
• shift,
• pressure,
• disorder,
• action,
• phenomenon,
• experience,
• problem,
• accident,
• discharge,
• attack,
• impact,
• failure,
• collapse,
• pain,
• development,
• mishap,
• cause,
• bang,
• motivation,
• shock,
• threat,