malevolent
The etchings of spiders seem to crawl malevolently off the page.
His eyes gleamed malevolently.
She stared at the man malevolently.

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