1. Causing fear or dread or terror
   - awful, dire, direful, dread, dreaded, dreadful, fearful, frightening, horrendous, horrific, terrible

See also: alarming, fearsomely

• seasoner
• seasoning
• seat
• seat cushion
• seat-of-the-pants
• seatbelt
• seated
• seating
• seating area
• seating capacity
• seating room
• seats
• Seattle
• Seattle Slew
• seawall
• seaward
• seawards
• seawater
• seaway
• seaweed
• seaworthiness
• seaworthy
• SEB
• sebaceous
• sebaceous cyst