Definition of sinistrous in English:

sinistrous

adjective

rare
  • Giving the impression that something bad will happen; ominous.

    ‘a sinistrous event’
    • ‘The king continues to disparage and asperse all sober and judicious reflections upon that royal paper, by charging upon them the unjust and reproachful character of sinistrous interpretations.’
    • ‘The arrival of a beggar on an island is accounted a sinistrous event.’
    • ‘The chiefs are now informed, that their bark, by a sinistrous accident, has been compelled to quit the shore.’
    • ‘Aramis smiled, with the sinistrous gleam of his sinistrous thought.’
    • ‘That people may be influenced by wrong and sinistrous ends and motives in this matter, is beyond all peradventure.’
    menacing, threatening, ominous, forbidding, baleful, frightening, eerie, alarming, disturbing, disquieting, dark, black, suggestive of evil, evil-looking
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Origin

Late 16th century: from sinister + -ous.

Pronunciation:

sinistrous

/ˈsɪnɪstrəs/