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Adjective sinister has 3 senses
- baleful, forbidding, menacing, minacious, minatory, ominous, sinister, threatening, ugly - threatening or foreshadowing evil or tragic developments; "a baleful look"; "forbidding thunderclouds"; "his tone became menacing"; "ominous rumblings of discontent"; "sinister storm clouds"; "a sinister smile"; "his threatening behavior"; "ugly black clouds"; "the situation became ugly"
Antonym: unalarming (indirect, via alarming)
- black, dark, sinister - stemming from evil characteristics or forces; wicked or dishonorable; "black deeds"; "a black lie"; "his black heart has concocted yet another black deed"; "Darth Vader of the dark side"; "a dark purpose"; "dark undercurrents of ethnic hostility"; "the scheme of some sinister intelligence bent on punishing him"-Thomas Hardy
Antonym: good (indirect, via evil)
- sinister - on or starting from the wearer's left; "bar sinister"
Antonym: dextral (indirect, via sinistral)
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