When it comes to antonyms for the word "most luxury," there are a few different options to consider. One antonym might be "most basic," which would imply that something is very simple, plain, or ordinary. Another possible antonym could be "most affordable," suggesting that something is inexpensive or budget-friendly. Alternatively, "most uncomfortable" might be an antonym, indicating that something is not very pleasant or enjoyable to use or experience. Other possibilities for antonyms for "most luxury" might include "most modest," "most simple," or "most ordinary," depending on the context in which the word is being used.