What are words which contradict themselves called? Fast means to go fast, but, to stand fast means to not move at all. Listen to this episode to understand such words! Sources:  https://medium.com/@jackashepherd/these-extremely-cool-words-mean-the-opposite-of-themselves-8e4f5fd63cd3 https://www.merriam-webster.com/words-at-play/words-own-opposites#:~:text=A%20'Janus%20word'%20is%20a,antagonyms%2C%20or%20auto%2Dantonyms. https://blog.maltalingua.com/what-are-janus-words/ https://www.economist.com/culture/2022/09/08/some-words-have-two-opposite-meanings-why https://en.wikipedia.org/wiki/Janus#:~:text=In%20ancient%20Roman%20religion%20and,named%20for%20Janus%20(Ianuarius). https://www.andersonlock.com/blog/god-doors/ https://en.wikipedia.org/wiki/Auto-antonym#:~:text=An%20auto%2Dantonym%20or%20autantonym,or%20%22to%20bind%20together%22.