1. So as to harm; with evil intention.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• michieviously,
• mischivously,
• mischiviously,
• mischevously,
• mishieviously,
• mischieviously,
• mischieveouly,
• mischeivously,
• mischeviously,
• nischievously,
• kischievously,
• jischievously,
• muschievously,
• mjschievously,
• mkschievously,
• moschievously,
• mischievousely,
• mischievousity,
• machievously,
• mischieivously

• mischievous,
• mischievousness.

The adjective form of the word "mischievously" is "mischievous".

The plural form of the word "mischievously" is not applicable since it is an adverb rather than a noun that can be pluralized. However, the word "mischievous" itself can be considered the plural form when used as an adjective to describe multiple individuals or things.

The singular form of the word "mischievously" is "mischievous"