transient

The word evokes a sense of fleetingness or a 'passing through' quality. It suggests something that exists in a state of transition, lacking stability or permanent roots. When used as an adjective for emotions or states (like joy or pain), it carries a slightly melancholic or clinical tone, emphasizing that the feeling is temporary and will inevitably vanish. It differs from 'brief' by focusing more on the process of passing away than just the duration. In a human context (as a noun), it often describes people who are unsettled or migratory. Depending on the setting, this can range from neutral (travelers) to socially charged descriptions of marginalized populations lacking permanent housing. In technical contexts, it refers to a sudden, short-lived burst of energy. Here, the feeling is one of instability—a deviation from the steady state that must be managed or suppressed.