Modifiers matching circumstance:

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

Simple categories matching stressful:

• setting,
• condition,
• event,
• habitat,
• treatment,
• work,
• emotion,
• situation,
• agent,
• exertion,
• behavior,
• job,
• state,
• posture,
• profession,
• incident,
• therapy,
• sport,
• circumstances,
• period,
• occasion,
• difficulty,
• circumstance,
• motion,
• procedure,
• activity,
• consequence,
• time,
• stimulus,
• experience,
• episode,
• times,
• manipulation,
• task,
• symptom,
• appointment,
• occurrence,
• change,
• process,
• intervention,
• conflict,