The word "萎靡不振" is formed by combining the two-character compounds "萎靡" and "不振"; "萎靡" means withered and dispirited, derived from "萎" (wither) and "靡" (prostrate), while "不振" means not roused, from "不" (not) and "振" (rouse); together they create a phrase describing a state of lethargy and low spirits.