transient
adj.adj. lasting for only a very short time. You use this to describe things that pass quickly, like a feeling or a weather event.
adj. lasting only for a short period; impermanent or ephemeral. Often describes physical phenomena or psychological states that lack duration.
The storm was transient and the sun soon returned.
The city has a large transient population of students and seasonal workers who stay for only a few months.
Philosophers often contrast the transient nature of physical beauty with the perceived permanence of mathematical truths or moral virtues.
From Late Latin transiēnt- (for classical transeunt-), stem of transiēns, present participle of trānsīre (“to go over, to pass”).
Often used attributively before a noun; frequently pairs with 'nature', 'population', or 'phenomena'.