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sinister

adjective
 
 
/ˈsɪn.ɪ.stər/ US  /-stɚ/

Definition

making you feel that something bad or evil might happen: The ruined house had a sinister appearance. A sinister-looking man sat in the corner of the room.Predicting things and intuition
(Definition of sinister adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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