sinister

[ sin-uh-ster ]
/ ˈsɪn ə stər /

adjective

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).

Origin of sinister

1375–1425; late Middle English < Latin: on the left hand or side, hence unfavorable, injurious

SYNONYMS FOR sinister

ANTONYMS FOR sinister

OTHER WORDS FROM sinister

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for sinisterly

British Dictionary definitions for sinisterly

sinister
/ (ˈsɪnɪstə) /

adjective

threatening or suggesting evil or harm; ominousa 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

Derived forms of sinister

sinisterly, adverbsinisterness, noun

Word Origin for sinister

C15: from Latin sinister on the left-hand side, considered by Roman augurs to be the unlucky one
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

Medicine definitions for sinisterly

sinister
[ sĭnĭ-stər ]

adj.

Presaging trouble; ominous.
On the left side; left.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.