malevolent
I thought they were making me wait out of sheer malevolence.
He is brash and egocentric with a touch of malevolence.
The problems were caused by ignorance, not malevolence.

SMART Vocabulary: related words and phrases

Morally wrong and evil
abhorrent
abhorrently
amoral
amorality
anomie
dissipated
dissolute
dissolutely
dissoluteness
enormity
nefariousness
no goodidiom
no more Mr Nice Guyidiom
non-ethical
obscene
trespass
turpitude
unconscionable
unconscionably
unethical

You can also find related words, phrases, and synonyms in the topics:

Treating people or animals badly