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

• seasnail
• season
• season ticket
• seasonable
• seasonableness
• seasonably
• seasonal
• seasonal adjustment
• seasonal affective disorder
• seasonal worker
• seasonally
• seasoned
• seasoned salt
• seasoner
• seasoning
• seat
• seat cushion
• seat-of-the-pants
• seatbelt
• seated
• seating
• seating area
• seating capacity
• seating room
• seats