Modifiers matching occurrence:

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

Simple categories matching unplanned:

• text,
• deviation,
• event,
• circumstances,
• incident,
• works,
• outage,
• occurrence,
• work,
• condition,
• departure,
• expense,
• activity,
• interruption,
• situation,
• job,
• downtime,
• disturbance,