Usually means: Threatening or suggesting evil, harm.
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We found 35 dictionaries that define the word sinister:

General (29 matching dictionaries)
  1. sinister: Longman Dictionary of Contemporary English
  2. sinister: Merriam-Webster
  3. sinister: Oxford Learner's Dictionaries
  4. sinister: American Heritage Dictionary of the English Language
  5. sinister: Collins English Dictionary
  6. sinister: Vocabulary.com
  7. Sinister, sinister: Wordnik
  8. sinister: Cambridge Advanced Learner's Dictionary
  9. sinister: Wiktionary
  10. sinister: Webster's New World College Dictionary, 4th Ed.
  11. sinister: The Wordsmyth English Dictionary-Thesaurus
  12. sinister: Infoplease Dictionary
  13. sinister: Dictionary.com
  14. sinister: Online Etymology Dictionary
  15. sinister: Cambridge Essential American English Dictionary
  16. Sinister (band), Sinister (film), Sinister: Wikipedia, the Free Encyclopedia
  17. Sinister: Online Plain Text English Dictionary
  18. sinister: Webster's Revised Unabridged, 1913 Edition
  19. sinister: Rhymezone
  20. sinister, sinister: AllWords.com Multi-Lingual Dictionary
  21. sinister: Webster's 1828 Dictionary
  22. sinister: FreeDictionary.org
  23. sinister: The Phrontistery - A Dictionary of Obscure Words
  24. sinister: Mnemonic Dictionary
  25. sinister: TheFreeDictionary.com
  26. sinister: Wikimedia Commons US English Pronunciations
  27. Sinister: Dictionary of Phrase and Fable (1898)

Art (1 matching dictionary)
  1. An Illustrated Dictionary of Jewelry (No longer online)

Business (1 matching dictionary)
  1. sinister: Legal dictionary

Computing (1 matching dictionary)
  1. sinister: Encyclopedia

Medicine (2 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. sinister: Medical dictionary

Slang (1 matching dictionary)
  1. sinister: Urban Dictionary

(Note: See sinisterly as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Inauspicious, ominous, unlucky, illegitimate (as in bar sinister).
adjective:  Evil or seemingly evil; indicating lurking danger or harm.
adjective:  (archaic) Of the left side.
adjective:  (heraldry) On the left side of a shield from the wearer's standpoint, and the right side to the viewer.
adjective:  (obsolete) Wrong, as springing from indirection or obliquity; perverse; dishonest.

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