Definition of nightmarish in English:

nightmarish

adjective

  • Of the nature of a nightmare; very frightening or unpleasant.

    ‘a nightmarish vision of the future’
    ‘a nightmarish eight-hour journey’
    • ‘It was the middle of the day, and the cloudless sky above took on a nightmarish shade of black.’
    • ‘Once night falls and your enemies switch from the mundane to the nightmarish, the game becomes a dark feast for the senses.’
    • ‘Not only did this nightmarish thing provoke instant nausea, it blocked my entire view of the stage!’
    • ‘I mean it's a sort of a mythic, horrible, nightmarish kind of vision, isn't it?’
    • ‘The story of the seven nightmarish days will be screened tonight at 7pm, with the second episode on January 15.’
    unearthly, monstrous, ghostly, spine-chilling, horrific, macabre, hideous, unspeakable, gruesome, grisly, ghastly, harrowing, hair-raising, disturbing, kafkaesque
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Pronunciation

nightmarish

/ˈnʌɪtmɛːrɪʃ/