mischievious

Etymology
From, under the influence of adjectives ending in.

Adjective

 * 1)   and 
 * 2) * 1795, a correspondent to the Home Office; quoted in 2014, John Stevenson, Popular Disturbances in England 1700-1832, 2nd edition, Routledge, p. 181
 * 'a want of food must and will keep the popular mind in such a state of irritability as to be easily worked upon by mischievious men'

Usage notes

 * This spelling, like, is attested from the 16th century on, so the corresponding pronunciation is at least as old.