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

• Delphinus
• Delphinus delphis
• delta
• delta hepatitis
• delta iron
• delta ray
• delta rhythm
• delta wave
• delta wing
• deltaic
• Deltasone
• deltiology
• deltoid
• deltoid eminence
• deltoid leaf
• deltoid muscle
• deltoid tuberosity
• delude
• deluge
• delusion
• delusional
• delusional disorder
• delusions of grandeur
• delusions of persecution
• delusive