1. (adj) baleful, forbidding, menacing, minacious, minatory, ominous, sinister, threatening
threatening or foreshadowing evil or tragic developments
Synonyms: grim, inauspicious, sullen, minacious, baneful, lowering, black, baleful, dark, sinister, heavy, minatory, dour, ominous, menacing, ill, forbidding, threatening
Antonyms: dextral, good, unalarming
2. (adj) black, dark, sinister
stemming from evil characteristics or forces; wicked or dishonorable
Synonyms: blackened, ominous, sullen, bootleg, black-market, disgraceful, calamitous, forbidding, dismal, dark, moody, non-white, disconsolate, threatening, coloured, glum, fatal, dark-skinned, black, fateful, baleful, smuggled, inglorious, menacing, dim, pitch-dark, glowering, minatory, obscure, sour, pitch-black, grim, mordant, drab, benighted, contraband, shameful, saturnine, disastrous, smutty, ignominious, sorry, gloomy, morose, bleak, dingy, dreary, dour, drear, opprobrious, minacious, blue, sinister
Antonyms: good, unalarming, dextral
3. (adj) sinister
on or starting from the wearer's left
Synonyms: forbidding, dark, minacious, baleful, minatory, black, menacing, threatening, ominous
Antonyms: unalarming, good, dextral
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Synonyms for sinister 
