Sinister.

[IQS.RLOW]

sinister
1. Threatening or suggesting malevolence, menace, evil, or harm.
2. On the left side of a heraldic shield as seen by the holder of the shield and the observer's right side.
3. Etymology: "prompted by malice or ill-will," from Old French sinistre, "contrary, unfavorable, to the left", from Latin sinister, "left, on the left side" or the opposite of dexter.

The earliest occurrences of Latin sinister mean "left" or "on the left side", but probably because of the left-handed ineptness or incompetence of most right-handers, sinister also developed the meaning of "awkward".
From this, it came to mean "injurious", "evil", or "unlucky"; and even today many widespread superstitions relate to the left or sinister side; such as, throwing salt over the left shoulder to bring good luck.
Sinister was borrowed into English in the fifteenth century, and though the earliest instances reflect the senses of "evil" and "inauspicious", it was also used during the same century with the directional senses of left.