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Adjective: frightening  frI-t(u)n-ing
  1. Causing fear, dread or terror
    "the frightening war";
    - awful, dire, direful, dread, dreaded, dreadful, fearful, fearsome, horrendous, horrific, terrible
Noun: frightening  frI-t(u)n-ing
  1. The act of inspiring with fear
    - terrorization, terrorisation [Brit]
Verb: frighten  frI-t(u)n
  1. Cause fear in
    "The stranger who hangs around the building frightens me";
    - fright [archaic], scare, affright

See also: alarming

Type of: bullying, excite, intimidation, shake, shake up, stimulate, stir