sinister

(adjective): Inauspicious, ominous, unlucky, illegitimate (as in bar sinister).
(adjective): Evil or seemingly evil; indicating lurking danger or harm.
(adjective): Of the left side.
(adjective): On the left side of a shield from the wearer's standpoint, and the right side to the viewer.
(adjective): Wrong, as springing from indirection or obliquity; perverse; dishonest.