frightening

Noun
  1. The act of inspiring with fear (synset 101225155)
Adjective
  1. Causing fear or dread or terror (synset 300195400)
    "the awful war"; "an awful risk"; "dire news"; "a career or vengeance so direful that London was shocked"; "the dread presence of the headmaster"; "polio is no longer the dreaded disease it once was"; "a dreadful storm"; "a fearful howling"; "horrendous explosions shook the city"; "a terrible curse"

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