noun
a left-handed person
adjective
giving the impression that something harmful or evil is happening or will happen
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The detective suspected that there was a sinister motive behind the seemingly accidental death.
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I always get a creepy feeling whenever I walk past that old, sinister-looking house.
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That new guy at work gives me a really sinister vibe, I don't trust him at all.
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The storm clouds gathered in a sinister manner, foreshadowing the impending bad weather.