(1):
(a.) Indicative of lurking evil or harm; boding covert danger; as, a sinister countenance.
(2):
(a.) Wrong, as springing from indirection or obliquity; perverse; dishonest; corrupt; as, sinister aims.
(3):
(a.) Unlucky; inauspicious; disastrous; injurious; evil; - the left being usually regarded as the unlucky side; as, sinister influences.
(4):
(a.) On the left hand, or the side of the left hand; left; - opposed to dexter, or right.