Sinister Definition

Threatening harm, evil, or misfortune; ominous; portentous.
Sinister storm clouds.
Webster's New World
Portending misfortune or disaster; ominous.
Sinister storm clouds.
American Heritage
Wicked, evil, or dishonest, esp. in some dark, mysterious way.
A sinister plot.
Webster's New World
On, to, or toward the left-hand side; left.
Webster's New World
Attended by or causing misfortune or disaster.
American Heritage

Origin of Sinister

  • From Middle English sinistre (“unlucky"), from Old French sinistra (“left"), from Latin sinestra (“left hand").

    From Wiktionary

  • Middle English sinistre unfavorable from Old French from Latin sinister on the left, unlucky

    From American Heritage Dictionary of the English Language, 5th Edition

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