sinister

1. (archaic) Of the left side.Examples: "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;"; "Before the train had stopped he had decorated his sinister shirt-cuff with the inscription, ‘J. P. Huddle, The Warren, Tilfield, near Slowborough.’"Antonyms: dexterarchaic

2. (heraldry) On the left side of a shield from the wearer's standpoint, and the right side to the viewer.Examples: "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."Antonyms: dexter

3. (obsolete) Wrong, as springing from indirection or obliquity; perverse; dishonest.Examples: "Nimble and sinister tricks and shifts."; "He scorns to undermine another's interest by any sinister or inferior arts."; "He read in their looks […] sinister intentions directed particularly toward himself."obsolete