- (a.) Indicative of lurking evil or harm; boding covert danger; as, a sinister countenance.
- (a.) Unlucky; inauspicious; disastrous; injurious; evil; -- the left being usually regarded as the unlucky side; as, sinister influences.
- (a.) On the left hand or the side of the left hand; left; -- opposed to dexter or right.
- (a.) Wrong, as springing from indirection or obliquity; perverse; dishonest; corrupt; as, sinister aims.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). sinister. Retrieved September 21, 2026, from http://smartdefine.org/sinister/definitions/2062281 |
| Chicago | Webster's. 2011. "sinister" http://smartdefine.org/sinister/definitions/2062281 (accessed September 21, 2026). |
| Harvard | Webster's 2011, sinister, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/sinister/definitions/2062281>. |
| MLA | Webster's. "sinister" 28 May 2011. Web. 21 September 2026. <http://smartdefine.org/sinister/definitions/2062281> |