Modifiers matching calamity:

• terrible,
• destructive,
• political,
• unforeseen,
• natural,
• national,
• public,
• marine,
• sudden,
• serious,
• massive,
• common,
• unfortunate,
• financial,
• world,
• international,
• violent,
• environmental,
• unforeseeable,
• physical,
• devastating,
• major,
• widespread,

Simple categories matching devastating:

• killer,
• cancer,
• event,
• calamity,
• disease,
• weather,
• state,
• occurrence,
• illness,
• problem,
• affliction,
• disorder,
• complication,
• condition,
• consequence,
• incident,
• injury,
• force,
• infection,
• storm,
• catastrophe,
• phenomenon,
• form,
• weapon,
• situation,
• thing,
• disaster,
• drug,
• earthquake,
• elements,