Mono no aware
Japanese term for the awareness of impermanence or transience of things, and both a transient gentle sadness or wistfulness at their passing as well as a longer, deeper gentle sadness about this state being the reality of life
Mono no aware, lit. 'the pathos of things', and also translated as 'an empathy toward things', or 'a sensitivity to ephemera', is a Japanese idiom for the awareness of impermanence (無常, mujō), or transience of things, and both a transient gentle sadness (or wistfulness) at their passing as well as a longer, deeper gentle sadness about this state being the reality of life. Wikipedia