mischievious

From mischievous, under the influence of adjectives ending in -ious.

• enPR: mĭs.chēʹ.vē.əs, IPA^(key): /mɪs.ˈt͡ʃiː.vi.əs/.
• Rhymes: -iːviəs

mischievious (comparative more mischievious, superlative most mischievious)

1. Nonstandard form of mischievous.

This spelling, mischevious, and similar ones can be found since the 16th century, so the corresponding pronunciation is at least as old. But despite being common in a wide range of social classes today, both these spellings and the corresponding pronunciation are still considered nonstandard and often seen as a sign of a lack of education.