Also found in: Thesaurus, Medical.
Related to sinistrous: sinistral, sinusitis


 (sĭn′ĭ-strəs, sĭ-nĭs′trəs)
adj. Archaic
Sinister; inauspicious.

sin′is·trous·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. sinister or ill-omened
2. (Anatomy) sinistral
3. (Zoology) sinistral
ˈsinistrously adv
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈsɪn ə strəs)

1. ill-omened; unlucky; disastrous.
2. sinistral; left.
[1550–60; < Latin sinistr-, s. of sinister (see sinister) + -ous]
sin′is•trous•ly, adv.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
(35) These are the exact adjectives used during one of the interviews by a 47-year old female worker in respect to the sinistrous episode of the early communist repression, recently coined in the literature under the name "The Pitest Phenomenon" (14th of November 2011).