ominous (adj.)
- abusive
- admonitory
- apocalyptic
- augural
- bad
- baleful
- baneful
- black
- blustering
- boding
- bullying
- cautionary
- comminatory
- corrosive
- corrupting
- corruptive
- counterproductive
- damaging
- dark
- deadly
- deleterious
- denunciatory
- depressed
- detrimental
- dire
- direful
- disadvantageous
- distressing
- dreary
- evil
- fatal
- fateful
- forbidding
- foreboding
- foreshadowing
- gloomy
- grim
- hapless
- harmful
- hostile
- hurtful
- ill
- ill-fated
- ill-omened
- ill-starred
- imminent
- inauspicious
- indicative
- inhospitable
- injurious
- intimidating
- lethal
- lowering
- luckless
- malefic
- maleficent
- malevolent
- malign
- malignant
- mantic
- meaningful
- menacing
- minacious
- minatory
- mischievous
- noisome
- noxious
- oracular
- pernicious
- poisonous
- portentous
- predictive
- prejudicial
- premonitory
- prognostic
- prophetic
- sad
- sibyllic
- sinister
- somber
- threatening
- toxic
- unblessed
- underprivileged
- unfavorable
- unfortunate
- unfriendly
- unhappy
- unlucky
- unpromising
- unpropitious
- untoward
- venomous
- vicious
- virulent
- warning
