Modifiers matching circumstance:

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

Simple categories matching unfortunate:

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