Modifiers matching circumstance:

• extreme,
• unfortunate,
• unusual,
• unforeseen,
• threatening,
• historical,
• stressful,
• exigent,
• negative,
• personal,
• extraordinary,
• special,
• unforeseeable,
• bad,
• unique,
• catastrophic,
• severe,
• relevant,
• involuntary,
• common,
• individual,
• external,
• verifiable,
• unexpected,
• unavoidable,
• exceptional,

Simple categories matching extraordinary:

• event,
• force,
• circumstances,
• energy,
• consequence,
• location,
• happening,
• proceeding,
• charge,
• incident,
• activity,
• transaction,
• phenomenon,
• condition,
• situation,
• occasion,
• item,
• occurrence,
• operations,
• measure,
• matter,
• thing,
• property,
• circumstance,
• action,
• gain,
• period,
• expense,
• animal,
• case,
• facility,
• peculiarity,
• change,
• risk,
• climate,
• weaponry,
• treatment,
• operation,
• cause,
• losses,
• being,
• experience,
• catastrophe,
• flood,
• offence,
• tort,
• value,
• act,