adj on the left hand, or the side of the left hand; left;
opposed to dexter, or right.
2. sinister ·adj indicative of lurking evil or harm; boding covert danger; as, a sinister countenance.
3. sinister ·adj wrong, as springing from indirection or obliquity; perverse; dishonest; corrupt; as, sinister aims.
4. sinister ·adj unlucky; inauspicious; disastrous; injurious; evil;
the left being usually regarded as the unlucky side; as, sinister influences.