unscience

From Middle English unscience (“false knowledge or understanding”), equivalent to un- +‎ science.

unscience (countable and uncountable, plural unsciences)

1. That which is unscientific or pseudoscientific.
   • 1380, Geoffrey Chaucer, Boethius and Troilus

     And at the laste, yif that any wight wene a thing to ben other weyes thanne it is, it is nat only unscience, but it is deceivable opinioun ful diverse and fer fro the sothe of science.

   • 1900, John Vosburgh Stevens (ed.), The Annual of Eclectic Medicine and Surgery

     It has been used in medicine from time immemorial; but until recently its use was nothing more than a species of mere unscience, shadowed in mystery.

   • 1973, Janet Lembke, Bronze and Iron

     Misapplication of this practical connection leads to such unsciences as astrology and alchemy and, with the Romans, augury.

• pseudoscience