On the left hand, or the side of the left hand; left; -- opposed to dexter, or right.
- Suggesting or threatening evil: a sinister smile.
- Presaging trouble; ominous: sinister storm clouds.
- Attended by or causing disaster or inauspicious circumstances.
- On the left side; left.
- Heraldry Situated on or being the side of a shield on the wearer's left and the observer's right.