momentary

Lasting for only a moment.

Occurring or present at every moment.

Short-lived or ephemeral, as a life.

Lasting but a moment or for a very short time; of short duration: as, a momentary pang.

Short-lived; likely to die soon or at any moment.

Occurring every moment: as, momentary interruptions.

Done in a moment; continuing only a moment; lasting a very short time.

Lasting for only a moment.

Happening at every moment; perpetual.

Ephemeral or relatively short-lived.