ephemeral

noun 0.850

fleetingness

noun 0.752

transitoriness

noun 0.751

impermanence

noun 0.749

transience

noun 0.733

temporariness

noun 0.720

momentariness

noun 0.705

transiency

noun 0.677

ephemeris

noun 0.673

ephemerides

noun 0.657

perishability

noun 0.647

ethereality

noun 0.609

transient

noun 0.606

evanescence

noun 0.593

imperishability

noun 0.593

temporality

noun 0.586

brevity

noun 0.576

briefness

noun 0.572

temporary

noun 0.562

eternality

noun 0.561

precarity

noun 0.556

fickleness

noun 0.556

perishable

noun 0.555

flightiness

noun 0.551

eternity

noun 0.547

finitude

noun 0.546

permanence

noun 0.542

intermittency

noun 0.539

permanency

noun 0.533

episodicity

noun 0.533

atemporality

noun 0.532

flash in the pan

noun 0.528

fragility

noun 0.528

short time

noun 0.526

imperishable

noun 0.526

tenuousness

noun 0.524

flimsiness

noun 0.522

effluxion of time

noun 0.522

intermittence

noun 0.522

inconstancy

noun 0.520

timelessness

noun 0.518

immateriality

noun 0.516

instancy

noun 0.511

deathlessness

noun 0.509

instantaneity

noun 0.508

elusiveness

noun 0.506

epiphenomenon

noun 0.506

precariousness

noun 0.505

superficiality

noun 0.505

expiration

noun 0.505

eternal

noun 0.504

mortality

noun 0.503

erodibility

noun 0.502