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used in a sentence
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Definition evil or harmful; or making an evil or frightening impression

Much more rarely and only in very old usage, sinister can refer to the left side of something.
  • They created a sinister plan to recruit terrorists.
sinister = evil
  • In the movie, there was a sinister plot to kill people and harvest their organs.
  • sinister = evil
  • The storm clouds look sinister.
  • Speaking quietly so that no one else would hear, Harry told the other two about Snape's sudden, sinister desire to be a Quidditch referee.
    J.K. Rowling  --  Harry Potter and the Sorcerer's Stone
  • sinister = threatening
  • And with this doubt, his whole statement fell to pieces, and I wondered if there wasn't something a little sinister about him, after all.
    F. Scott Fitzgerald  --  The Great Gatsby
  • sinister = foreshadowing bad things
  • An evil forest was, therefore, alive with sinister forces and powers of darkness.
    Chinua Achebe  --  Things Fall Apart
  • sinister = evil, harmful, or frightening
  • Then Charles Wallace giggled, a giggle that was the most sinister sound Meg had ever heard.
    Madeleine L'Engle  --  A Wrinkle in Time
  • sinister = evil or frightening
  • I lived at West Egg, the — well, the less fashionable of the two, though this is a most superficial tag to express the bizarre and not a little sinister contrast between them.
    F. Scott Fitzgerald  --  The Great Gatsby
  • sinister = foreshadowing harm
  • Just as she caught up with them Charles Wallace stopped and raised his hand, and there was the elevator again, its yellow light sinister.
    Madeleine L'Engle  --  A Wrinkle in Time
  • sinister = evil or frightening
  • They had thrown down their waterpots and lain by the roadside expecting the sinister light to descend on them and kill them.
    Chinua Achebe  --  Things Fall Apart
  • sinister = evil or frightening
  • I could see nothing sinister about him.
    F. Scott Fitzgerald  --  The Great Gatsby
  • sinister = evil or frightening
  • The late afternoon light had a greenish cast which the blank windows reflected in a sinister way.
    Madeleine L'Engle  --  A Wrinkle in Time
  • sinister = evil or frightening
  • When he began again, the anger on his face was gone, and in its place a sort of smile hovered, more terrible and more sinister than the anger.
    Chinua Achebe  --  Things Fall Apart
  • sinister = frightening
  • Dangerous animals became even more sinister and uncanny in the dark.
    Chinua Achebe  --  Things Fall Apart
  • sinister = dangerous or frightening
  • For all I knew he was going to rob the house in a moment; I wouldn't have been surprised to see sinister faces, the faces of "Wolfshiem's people," behind him in the dark shrubbery.
    F. Scott Fitzgerald  --  The Great Gatsby
  • sinister = frightening
  • You looked as if you were bent on some sinister errand, and after you had left me I wondered whether I ought to have let you go.
    Henry James  --  The American
  • He fought against the Shade's sinister thoughts, weakly at first, then more strongly.
    Christopher Paolini  --  Eragon
  • At night, the cooking fires of squatters living in it gave the structure a sinister jack-o-lantern glow.
    Greg Mortenson & David Oliver Relin  --  Three Cups of Tea
  • Police cars and sinister-looking black vans blocked the curbs all around us.
    Rick Riordan  --  The Red Pyramid
  • "It looks pretty sinister," he said.
    John Howard Griffin  --  Black Like Me

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