Dictionary.com
Thesaurus.com
Synonyms

sinister

American  
[sin-uh-ster] / ˈsɪn ə stər /

adjective

  1. threatening or portending evil, harm, or trouble; ominous.

    a sinister remark.

    Synonyms:
    portentous, inauspicious
    Antonyms:
    benign
  2. bad, evil, base, or wicked; fell.

    his sinister purposes.

  3. unfortunate; disastrous; unfavorable.

    a sinister accident.

    Synonyms:
    unlucky
    Antonyms:
    favorable
  4. of or on the left side; left.

  5. Heraldry. noting the side of an escutcheon or achievement of arms that is to the left of the bearer (dexter ).


sinister British  
/ ˈsɪnɪstə /

adjective

  1. threatening or suggesting evil or harm; ominous

    a sinister glance

  2. evil or treacherous, esp in a mysterious way

  3. (usually postpositive) heraldry of, on, or starting from the left side from the bearer's point of view and therefore on the spectator's right

  4. archaic located on the left side

  5. archaic (of signs, omens, etc) unfavourable

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

  • sinisterly adverb
  • sinisterness noun
  • unsinister adjective
  • unsinisterly adverb
  • unsinisterness noun

Etymology

Origin of sinister

First recorded in 1375–1425; late Middle English, from Latin: “on the left hand or side,” hence, “unfavorable, injurious”

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

But getting back to it would require passing by that sinister doorway.

From Literature

“The childish scribbling handwriting is also a red herring for some of the more serious and sinister themes in the book, “ says Cash.

From Los Angeles Times

The movie’s real draw is its blissfully sinister sound design, which utilizes the podcaster lifestyle to go full maximalist while the film’s visual landscape remains sparse and disquieting.

From Salon

His angular head topped with a green felt crown; his toothy mouth a sinister, grimacing gash; his eyes blackened with what looks like charcoal.

From Los Angeles Times

“We would interpret the correction signal activation as warning of a potential further short-term correction in the S&P 500 to test the 200-day moving average support, rather than anything more sinister for now.”

From MarketWatch