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sinister (adj) appearing evil or dangerous.
Something sinister appears evil and dangerous. It makes you think that something bad or dangerous is going to happen. Sinister designs are evil plans. Something is sinister about a person if they appear evil or dangerous.
- The boy felt that there was something sinister about the stranger. The boy was afraid that the stranger might be evil and harm him.
- People came to know of his sinister designs only in the end, when he harmed everyone some way or the other. They were unable to understand till the end the evil and dangerous nature of his designs.