Definition of "frightening" []

• Causing fear; of capable of causing fear; scary. (adjective)
• Awful, terrible, very bad. (adjective)
• Present participle of frighten. (verb)

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• "What makes Palin frightening is that there are people who actually buy into her scare tactics and fear mongering."
• "Now, as she vows to appeal, the domestic diva says she's ready to face another episode in what she calls a frightening dream."
• "After what he describes as a frightening, involuntary hospital stay, he was suspended from the force."