ominous

equivalents

alarming

unpropitious

synonyms

abusive

admonitory

apocalyptic

augural

bad

badly off

baleful

baneful

black

bludgeoning

blustering

bodeful

boding

browbeating

bulldozing

bullying

cautionary

comminatory

corroding

corrosive

corrupting

corruptive

counterproductive

damaging

dark

deadly

deleterious

denunciatory

depressed

detrimental

dire

direful

disadvantageous

disserviceable

distressing

donsie

doomful

dreary

evil

evil-starred

fatal

fateful

fear-inspiring

forbidding

foreboding

foreshadowing

foretelling

foretokening

fortuneless

funest

etymologically-related-terms

omen

same-contexts

awful

eerie

ghastly

harsh

mournful

sinister

unmistakable

vague

weird