Modifiers matching circumstance:

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

Simple categories matching threatening:

• condition,
• animal,
• material,
• disease,
• incident,
• virus,
• nature,
• phenomenon,
• emergency,
• substance,
• illness,
• problem,
• event,
• artefact,
• process,
• situation,
• item,
• infection,
• conflict,
• conduct,
• malady,
• pathology,
• reaction,
• experience,
• behaviour,
• action,
• allergy,
• circumstance,
• cause,
• behavior,
• object,
• humanity,
• disorder,
• crime,
• complication,
• property,
• drug,
• activity,
• heritage,
• injury,
• weapon,