George Orwell’s “1984” uses the term ‘doubleplusungood’. It’s meant as a rather direct insult to mean that something was absolutely horrendous and awful. Instead of using “horrendous”, “awful”, or “horrible”, the people would use “doubleplusungood” to describe how horrible it was. Other doublespeak words includ doublethink, goodthink, goodsex, and even the word misprinted is a doublespeak work.
SPOILER ALERT. Stop reading here if you haven’t read the novel. The novel takes place in the year it’s named after. The novel follows a man who begins by absolutely loving the system he’s under. He works a mundane job, and it’s basically the same thing everyday. He falls in love with a young woman that intrigues him, and intrigue unfolds dually as he gets involved with her.