Synonyms of the word

short-lived

• adj. Alive or existent for only a short period of time.

ephemeral

• n. Something which lasts for a short period of time.
• adj. Lasting for a short period of time.
• adj. (biology) Existing for only one day, as with some flowers, insects, and diseases.
• adj. (geology, of a body of water) Usually dry, but filling with water for brief periods during and after precipitation.

fugacious

• adj. Fleeting, fading quickly, transient.

impermanent

• adj. Not permanent; momentary.

passing

• v. present participle of pass.
• adj. That passes away; ephemeral.
• adj. (now rare, literary) Pre-eminent, excellent, extreme.
• adj. vague, cursory.
• adj. going past - passing cars.
• adv. (now literary or archaic) Surpassingly, greatly.
• n. Death, dying; the end of something.
• n. The fact of going past; a movement from one place to another or a change from one state to another.
• n. (law) The act of approving a bill etc.
• n. (sports) The act of passing a ball etc. to another player.
• n. A form of juggling where several people pass props between each other, usually clubs or rings.

temporary

• adj. Not permanent; existing only for a period or periods of time.
• adj. Existing only for a short time or short times; transient, ephemeral.
• n. One serving for a limited time; short-term employee.

transient

• adj. Passing or disappearing with time; transitory.
• adj. Remaining for only a brief time.
• adj. (physics) Decaying with time, especially exponentially.
• adj. (mathematics, stochastic processes, of a state) having a positive probability of being left and never…
• adj. Occasional; isolated; one-off; individual.
• adj. Passing through; passing from one person to another.
• adj. (philosophy) Operating beyond itself; having an external effect.
• n. Something which is transient.
• n. (physics) A transient phenomenon, especially an electric current; a very brief surge.
• n. (acoustics) A relatively loud, non-repeating signal in an audio waveform which occurs very quickly, such…
• n. A person who passes through a place for a short time; a traveller; a migrant worker.
• n. An unhoused person.

transitory

• adj. Lasting only a short time; temporary.
• adj. (law, of an action) That may be brought in any county; opposed to local.