SIN'ISTER, adjective [Latin Probably the primary sense is weak, defective.]
1. Left; on the left hand, or the side of the left hand; opposed to dexter or right; as the sinister cheek; or the sinister side of an escutcheon.
2. Evil; bad; corrupt; perverse; dishonest; as sinister means; sinister purpose. He scorns to undermine another's interest by any sinister or inferior arts.
3. Unlucky; inauspicious.
4. sinister aspect, in astrology, an appearance of two planets happening according to the succession of the signs; as Saturn in Aries, and Mars in the same degree of Gemini.