threatening or portending evil, harm, or trouble; ominous: a sinister remark.
bad, evil, base, or wicked; fell: his sinister purposes.
unfortunate; disastrous; unfavorable: a sinister accident.
of or on the left side; left.
Heraldry. noting the side of an escutcheon or achievement of arms that is to the left of the bearer (opposed to dexter).
- sin·is·ter·ly, adverb
- sin·is·ter·ness, noun
- un·sin·is·ter, adjective
- un·sin·is·ter·ly, adverb
- un·sin·is·ter·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
British Dictionary definitions for sinister
threatening or suggesting evil or harm; ominous: a sinister glance
evil or treacherous, esp in a mysterious way
(usually postpositive) heraldry of, on, or starting from the left side from the bearer's point of view and therefore on the spectator's right
archaic located on the left side
archaic (of signs, omens, etc) unfavourable
- Compare dexter 1
- sinisterly, adverb
- sinisterness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012