scary
怖い
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The usual word for scary.
$$$
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すさまじい
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Scary because of its extraordinary magnitude:usually used with natural disasters:a huge typhoon, a giant tsunami, a fierce storm. Emphasizes the degree – almost beyond measuring.
NPSITU
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おっかない
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Same as こわい – but a tad more childish.
PPP
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恐ろしい
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Horrible, terrifying. Like すさまじい、 恐ろしい emphasizes the extent or force of something, rather than its appearance or fangs or whatever. He drove the car at a terrifying, terribly fast speed. You’ll shudder when you learn the awful truth about the president!
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Wait, here’s a better distinction: Use 怖い or おっかない about scary things you saw with your own eyes, but USE 恐ろしい OR すさまじい ABOUT THINGS YOU READ ABOUT / HEARD ABOUT.