Not fierce; Not bad

become antagonistic

commit all sorts of crimes and wickedness

ferocious

to look fierce and intimidating [written and colloquial]

utterly evil and morally wrong

disgust

good and evil

likes and dislikes

loud, rude, with a bad attitude

hating evil people and evil things, as much as one hates his / her enemies

agressive; bad-tempered

villain

A wicked person will be harassed or bedeviled by another of like; That comes around; Bad guys will not end well.

pranking

unlucky signs; a bad omen

abominable

bad influence

evil forces

worsen

notoriety

hard to stomach; difficult to deal with / tackle [colloquial]

hard to stomach; difficult to deal with / tackle [colloquial]

nightmare

adj; atrocious; behaving rude and unreasonable

sickening

malignant

vicious cycle

(adjective) Malicious

bad feeling