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