sinister

Suggesting or threatening harm or evil.

Causing or intending harm or evil; wicked.

Portending misfortune or disaster; ominous.

Attended by or causing misfortune or disaster.

On the left side; left.

Situated on or being the side of a shield on the wearer’s left and the observer’s right.

Left, as opposed to right; on the left side; specifically, in heraldry, noting the left-hand side of the person who carries the shield on his arm (therefore the right-hand side of the spectator): the sinister part of the escutcheon is opposed to the dexter part (see dexter).