Akademik

frightening
I
noun
the act of inspiring with fear
Syn: ↑terrorization, ↑terrorisation
Derivationally related forms: ↑frighten, ↑terrorise (for: ↑terrorisation), ↑terrorize (for: ↑terrorization)
Topics: ↑terrorism, ↑act of terrorism, ↑terrorist act
Hypernyms: ↑bullying, ↑intimidation
II
adjective
causing fear or dread or terror (Freq. 6)
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the awful war

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an awful risk

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dire news

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a career or vengeance so direful that London was shocked

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the dread presence of the headmaster

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polio is no longer the dreaded disease it once was

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a dreadful storm

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a fearful howling

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horrendous explosions shook the city

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a terrible curse

Syn:
awful, ↑dire, ↑direful, ↑dread, ↑dreaded, ↑dreadful, ↑fearful, ↑fearsome, ↑horrendous, ↑horrific, ↑terrible
Similar to: ↑alarming
Derivationally related forms: ↑terribleness (for: ↑terrible), ↑dread (for: ↑dread), ↑awfulness (for: ↑awful)

Useful english dictionary. 2012.