mischievousness vs badness

mischievousness and badness both are nouns.

Word	Noun	Adjective	Verb	Adverb
mischievousness	Yes	No	No	No
badness	Yes	No	No	No

As nouns, mischievousness and badness are synonyms defined as:

Other synonyms of mischievousness include naughtiness.

mischievousness (noun)	badness (noun)
reckless or malicious behavior that causes discomfort or annoyance in others	that which is below standard or expectations as of ethics or decency
an attribute of mischievous children	used of the degree of something undesirable e.g. pain or weather
the trait of behaving like an imp	an attribute of mischievous children