sinister

adjective5

1. •
   Evil or seemingly evil; indicating lurking danger or harm.

   • sinister influences
2. •
   Inauspicious, ominous, unlucky, illegitimate.

   • All the several ills that visit earth / Brought forth by night, with a sinister birth. — 1611
3. •
   On the left side of a shield from the wearer's standpoint, and the right side to the viewer.
4. •
   (no longer used) Wrong, as springing from indirection or obliquity; perverse; dishonest.

   • Nimble and sinister tricks and shifts. — 1625
5. •
   (no longer used) Of the left side.

   • my Mothers bloud / Runs on the dexter checke, and this sinister / Bounds in my fathers: — 1602