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English definition of “frightening”

frightening

adjective  /ˈfrɑɪ·tən·ɪŋ/ us  
making you feel fear: a frightening situation Frightening can also mean extreme: My car insurance payments are frightening.
frighteningly
adverb  /ˈfrɑɪ·tən·ɪŋ·li/ us  
His heart rate changed frighteningly.
(Definition of frightening from the Cambridge Academic Content Dictionary © Cambridge University Press)
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