Modifiers matching epidemic:

• resultant,
• sudden,
• major,

Simple categories matching sudden:

• change,
• transformation,
• failure,
• event,
• pressure,
• noise,
• trauma,
• episode,
• force,
• disturbance,
• death,
• turbulence,
• tragedy,
• shift,
• emotion,
• infection,
• incident,
• threat,
• motivation,
• occurrence,
• bang,
• problem,
• disaster,
• emergency,
• symptom,
• calamity,
• attack,
• move,
• catastrophe,
• cause,
• disorder,
• action,
• movement,
• reversal,
• collapse,
• illness,
• motion,
• injury,
• development,
• setback,
• condition,
• phenomenon,
• light,
• sound,
• impact,
• weather,
• discharge,
• feeling,
• process,
• shock,
• situation,
• experience,
• pain,
• epidemic,
• mishap,
• misfortune,
• accident,