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Adjective: nightmarish  'nIt,meh-rish
  1. Extremely alarming
    "He speaks of life itself as being nightmarish, because of wars, disasters, hatred, persecution and other ills";
    - bloodcurdling, hair-raising

See also: alarming

Encyclopedia: Nightmarish

Nearest

nightie
Nightingale
nightingale
nightjar
nightlife
night-light
night-line
nightlong
nightly
nightmare
nightmarish
nightmarishness
nightrider
night-robe
nightshade
nightshirt
nightside
night-sight
nightspot
nightstand
nightstick