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frightening

adjective
 
 
/ˈfraɪ.tən.ɪŋ/

Definition

B1 making you feel fear: a frightening thought a frightening film It is frightening to think what might happen if she left him.Describing things that cause fear frighteningly
 
 
/-li/ adverb
She looked frighteningly thin.Describing things that cause fear
(Definition of frightening adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of frightening