menacing (adj.)
- abusive
- alarming
- apocalyptic
- approaching
- bad
- baleful
- baneful
- black
- blustering
- boding
- bullying
- chancy
- close
- coming
- comminatory
- critical
- dangerous
- dark
- denunciatory
- dire
- dreary
- evil
- explosive
- fateful
- foreboding
- forthcoming
- frightening
- future
- gathering
- gloomy
- hazardous
- ill
- ill-fated
- ill-omened
- ill-starred
- immediate
- imminent
- impendent
- impending
- inauspicious
- instant
- intimidating
- looming
- lowering
- minacious
- minatory
- near
- ominous
- parlous
- perilous
- portentous
- risky
- serious
- sinister
- somber
- terrifying
- threatening
- ugly
- unfavorable
- unfortunate
- unlucky
- unpromising
- unpropitious
- untoward
- upcoming
- waiting
