Synonyms of the word

impermanent

• adj. Not permanent; momentary.

acting

• adj. Temporarily assuming the duties or authority of another person when they are unable to do their job.
• v. present participle of act.
• n. An intended action or deed.
• n. Pretending.
• n. (drama) The occupation of an actor.
• n. (law) The deeds or actions of parties are called actings to avoid confusion with the legal senses of deeds…

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.

episodic

• adj. relating to an episode.
• adj. sporadic, happening infrequently and irregularly.
• adj. (literature) made up a sequence of seemingly unconnected episodes.

evanescent

• adj. Vanishing, disappearing.
• adj. Ephemeral, momentary, fleeting.
• adj. Barely there; almost imperceptible.

finite

• adj. Having an end or limit; constrained by bounds.
• adj. (grammar, as opposed to infinite) limited by person or number.

fly-by-night

• n. A creature which flies at night; a nocturnal flier or traveler.
• n. One who departs or flees at night in order to avoid creditors, law enforcement etc. (often used attributively).
• n. (idiomatic, derogatory) A person or business that appears and disappears rapidly, or gives an impression…
• n. (idiomatic, derogatory) A traveling businessman or tradesman.

fugacious

• adj. Fleeting, fading quickly, transient.

improvised

• adj. created by improvisation; impromptu; unrehearsed.
• v. simple past tense and past participle of improvise.

interim

• adj. transitional.
• adj. temporary.
• n. A transitional or temporary period between other events.

jury-rigged

• v. simple past tense and past participle of jury-rig.
• adj. Improvised from whatever is available.

makeshift

• n. A temporary (usually insubstantial) substitution.
• adj. Made to work or suffice; improvised; substituted.

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.

short-lived

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

temporal

• adj. (also grammar) Of or relating to time.
• adj. Of limited time; not perpetual.
• adj. Of or relating to the material world, as opposed to spiritual.
• adj. Lasting a short time only.
• adj. Civil or political, as distinguished from ecclesiastical.
• n. (chiefly in the plural) Anything temporal or secular; a temporality.
• adj. of the temples of the head.
• n. (anatomy) Either of the bones on the side of the skull, near the ears.
• n. Any of a reptile's scales on the side of the head between the parietal and supralabial scales, and behind…

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.

terminable

• adj. Having an ending, finite.

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.

unstable

• adj. Having a strong tendency to change.
• adj. Fluctuating; not constant.
• adj. Fickle.
• adj. Unpredictable.
• adj. (chemistry) Readily decomposable.
• adj. (physics) Radioactive, especially with a short half-life.
• v. (transitive) To release (an animal) from a stable.

working

• n. (usually in the plural) Operation; action.
• n. Method of operation.
• n. Fermentation.
• n. (of bodies of water) Becoming full of a vegetable substance.
• v. present participle of work.
• adj. That is or are functioning.
• adj. That suffices but requires additional work.
• adj. In paid employment.
• adj. Of or relating to employment.
• adj. Enough to allow one to use something.