Meaning of “sinister” in the English Dictionary

american-english dictionary

(Definition of “sinister” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"sinister" in American English

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sinisteradjective [ not gradable ]

us /ˈsɪn·ə·stər/

evil, or suggesting that something evil is going to happen:

She has dark, sinister eyes that make you nervous when she looks at you.

(Definition of “sinister” from the Cambridge Academic Content Dictionary © Cambridge University Press)