sinister

Inauspicious, ominous, unlucky, illegitimate.

• bar sinister

Evil or seemingly evil; indicating lurking danger or harm.

• sinister influences
• the sinister atmosphere of the crypt

Of the left side.archaic

• my Mothers bloud / Runs on the dexter checke, and this ſiniſter / Bounds in my fathers:
• His ſicatrice, with an Embleme of warre, heere on his ſiniſter cheeke;

Of the left side.; On the left side of a shield from the wearer's standpoint, and the right side to the viewer.archaic

• The shield was divided into five, with two coats of arms on the dexter side (the right-hand side from the point of view of the bearer of the shield)—London and Southampton—and three on the sinister side—Salisbury, Winchester and Portsmouth.

Wrong, as springing from indirection or obliquity; perverse; dishonest.obsolete

• Nimble and sinister tricks and shifts.
• He scorns to undermine another's interest by any sinister or inferior arts.