1. Causing fear or dread or terror
   "horrendous explosions shook the city"
   - awful, dire, direful, dread, dreaded, dreadful, fearful, fearsome, frightening, horrific, terrible

See also: alarming

• ball field
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• ball of fire
• ball over
• ball valve
• ball-and-socket joint
• ball-breaker
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• ball-shaped
• ballad
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• ballerina