“Sinister” Originally Meant “Left”
Today, sinister describes something threatening, evil, or disturbingly suspicious. But in ancient Rome, it could simply tell you which direction to look: left.
The English word comes through French from the Latin sinister, meaning “on the left side.” Latin also used it figuratively for something unlucky or unfavorable.
Why did left become associated with danger?
Most people are right-handed, so the right hand historically appeared stronger, more skillful, and more “correct.” Left-handed movements could seem unusual or awkward. Religious customs, social conventions, and beliefs about omens reinforced this preference, although interpretations of left-side omens varied across ancient traditions.
When sinister entered English during the Middle Ages, its directional meaning still existed. Heraldry preserves it today: the sinister side of a shield is the bearer’s left. But the negative associations gradually took over. The word moved from “left-sided” to “unlucky,” then “ominous,” and finally “evil or menacing.”
Here is the memorable contrast: Latin dexter meant “right.” It gave English dexterity, meaning skillfulness. Ambidextrous literally suggests having two right hands.
French produced a similar pair. Gauche, meaning “left,” also means awkward or socially clumsy, while adroit, meaning skillful, developed from a word meaning “to the right.”
So language handed the right side competence and respectability—and unfairly left the left side with awkwardness, bad luck, and evil.
For left-handed people, the history of sinister is itself rather sinister. Merriam-Webster
