inauspicious
unfortunate
adverse
apocalyptic
bad
baleful
baneful
black
bodeful
boding
dark
dire
doomful
doubtable
doubtful
dreary
dubious
dubitable
evil
evil-starred
fateful
foreboding
gloomy
hardly possible
hopeless
ill
ill-boding
ill-fated
ill-omened
ill-starred
implausible
improbable
incredible
lowering
menacing
more than doubtful
of evil portent
ominous
portending
portentous
questionable
sinister
somber
threatening
unfavorable
unlikely
unlucky
unpropitious
untoward
cheerless
congenial
daunt
disheartening
inhospitable
innocuous
irksome
onerous
paradoxical
propitious
repulsive
thankless
unattractive
uncongenial
unfavourable
uninhabitable
uninteresting
uninviting
unlovely
promising