Modifiers matching episode:

• single,
• exciting,
• traumatic,
• special,
• acute,
• new,
• interesting,
• catastrophic,
• neurological,
• negative,
• violent,
• unpredictable,
• major,
• historical,
• stressful,
• multiple,
• memorable,
• cardiovascular,
• ischaemic,
• medical,
• tectonic,
• meteorological,
• painful,
• tragic,
• symptomatic,
• volcanic,
• infrequent,
• criminal,
• physiological,
• biblical,
• disastrous,
• sudden,
• textual,
• past,
• unfortunate,
• chaotic,
• geological,
• periodic,
• related,

Simple categories matching infrequent:

• event,
• cause,
• occurrence,
• hazard,
• morbidity,
• episode,
• disturbance,
• organelle,
• occasion,
• symptom,
• relationship,
• expenditure,
• activity,
• catastrophe,
• fire,
• movement,
• process,