Impermanence is the fact that things do not stay the same forever. People, feelings, weather, even buildings — they change, and they end. In English this word often sounds thoughtful, something you meet in essays or talks about life, not in the market. Though actually, English speakers may use it quite lightly, just to mean “it isn't permanent,” without any religious weight. In Taiwan you already have a close hook: 無常. That Buddhist idea is the deep version of the same thought; English impermanence can carry that, or it can just be the plain opposite of permanence.