adjective
relating to the River Acheron in ancient Greek mythology, which was believed to be a branch of the underworld; infernal or gloomy
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The acherontic depths of the ocean remain largely unexplored.
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I don't want to watch that acherontic movie, it's too scary.
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The abandoned house has such an acherontic vibe, let's not go there.
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The acherontic pain of losing a loved one can be unbearable.