perverse

Etymology

From Old French pervers, from Latin perversum, past participle of pervertere > per- 'thoroughly' + vertere 'to turn'. So, "thoroughly turned".

adj

1. Turned aside while against something, splitting off from a thing.
   Any man who succeeds in diverting the public taste, or in turning back a perverse stream which will flow in the direction of the ditch, leaves a mark, as it were, and cannot be overlooked by posterity. 1872, The Gentleman's Magazine - Volume 232, page 367
   But in the same sense are modern Nietzsche's screams against the perverse (diverted) diffusion of these elemental pleas to reason for “reasons,” for the reasons—and place—of our fall in nonsense. 2008, Harrison Mujica-Jenkins, The Ninth Hour, page 221221
   The diverted or perverse way is also not an easy path to walk. It is rightly called “crooked” and “twisting.” 2013, Robert Saucy, Minding the Heart: The Way of Spiritual Transformation
2. Morally wrong or evil; wicked; perverted.
   Looking at Barbara one would have considerable difficulty detecting a perverse side to her nature. Her expression was demure, shy, and apprehensive. But she recognized the demonic aspect of her personality and admitted it. I felt most alive when I felt most perverse. At college, sleeping with boys had a perverse quality. I slept with a boy friend of one of my girl friends, and I was proud of it. I bragged about it because I had done something perverse. Another time, I slept with a man, fat and ugly, who paid me for it. I was very proud. I felt I had the ability to do something different. 1967, Alexander Lowen, The Betrayal of the Body, U.S.A.: Macmillan Publishing Company, published 1969, page 13
3. Obstinately in the wrong; stubborn; intractable.
4. Wayward; vexing; contrary.
   [The researchers] noticed many of their pieces of [plastic marine] debris sported surface pits around two microns across.[…]Closer examination showed that some of these pits did, indeed, contain bacteria, and that in several cases these bacteria were dividing and thus, by the perverse arithmetic of biological terminology, multiplying. 2013-07-20, “Welcome to the plastisphere”, in The Economist, volume 408, number 8845
5. (law, of a verdict) Ignoring the evidence or the judge's opinions.

noun

1. (geometry) A chiral opposite of something; a mirror image with opposite handedness.
   If two antipodal points move continuously on the sphere, they trace out what are called symmetric figures. These figures have corresponding elements equal, and are equal in area, but are not in general superposable. The one is, in fact, the perverse of the other. 1884, Robert Edgar Allardice, Spherical Geometry

verb

1. (nonstandard) To pervert.
   This rule hath been always for the commodity of that kingdom, where as the powers have been thus by them perversed. 1545, John Bale, Image of Both Churches
   And though impartial history now and then cast the alow (halo) of a martyr over an unsuccessful patriot's grave; yet even that was not always sure; tyrants often perversed history, sullied by adulation or by fear; — but whetever that last verdict might have been; for him who dared to struggle against despotism, when he struggled in vain, there was no honor on earth; victorious tyranny marked the front of virtue with the brand of a criminal. February 6, 1852, Louis Kossuth, Address delivered before the General Assembly of Ohio
   That I have loved you My most puissant disciple I am the fabric of life and death Humanity has perversed the truth 2013, Winter Laake, Enter-The Vampire
   A second sun burst for an instant at first, Then glittered and glinted and twilight perversed And limbs limned in red quenched the sands of their thirst, The limbs of a human by all the Fates cursed; 2014, Maurits Zwankhuizen, The Desert Rose Inn