Modifiers matching occurrence:

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

Simple categories matching unfortunate:

• occurrence,
• phenomenon,
• eventuality,
• event,
• measure,
• animal,
• accident,
• connection,
• creature,
• episode,
• circumstance,
• experience,
• incident,
• circumstances,
• condition,
• child,
• thing,
• instance,
• happening,
• situation,
• calamity,
• rebirth,