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of the nature of or involving .
directly opposed or contrasted; opposite.
Contemporary Examples

This kind of attitude should be antithetical to feminist thought because it is infantilizing to women.
What Do Dems Have Against Women? Kirsten Powers October 7, 2010

He insists that the leading Catholic university in America ought not to bestow honors on someone of antithetical views.
Showdown at Notre Dame Christopher Buckley April 9, 2009

This latter approach is antithetical to peace and a two-state solution, now or in the future.
The Siren Call of Israeli Unilateralism Lara Friedman June 17, 2012

Trying to use it do so is antithetical to the achievement of peace and the two-state solution.
Exploiting Jews from Arab Countries Lara Friedman August 1, 2012

Yet Anders Gravers is in fact a bona fide xenophobe whose views are antithetical to freedom.
The Opponents of Militant Islamism Are Often As Bigoted as Their Targets Jacob Mchangama December 6, 2013

Historical Examples

It is true that for many years, and with some justification, Socialism was looked upon as antithetical to Liberalism.
Readings on Fascism and National Socialism Various

Explain the opposite Inflections on antithetical words and phrases.
The Ontario High School Reader A.E. Marty

The name was not adopted as antithetical to, or distinctive from, “confederate,” as some seem to have imagined.
The Rise and Fall of the Confederate Government, Vol. 1 (of 2) Jefferson Davis

Why speak of the God of nature and the God of grace as two antithetical terms?
Glaucus Charles Kingsley

Not having at hand the simile synthetical, we have resorted to the antithetical.
Jacob Faithful Captain Frederick Marryat

adjective
of the nature of antithesis
directly contrasted
adj.

1580s, from Greek antithetikos “setting in opposition,” from antithetos “placed in opposition” (see antithetic) + -al (1). Related: Antithetically.
adj.

“containing an antithesis,” c.1600, from Greek antithetikos “setting in opposition,” from antithetos “placed in opposition,” from antithesis (see antithesis).