Modifiers matching episode:

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

Simple categories matching infrequent:

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