most transitory

changeable deciduous emigrating ephemeral evanescent flash fleeting flitting fly-by-night flying fugacious fugitive going by impermanent insubstantial migrating momentary moving passing provisional short short-lived short-term temporal transmigratory unstable vacating volatile

enduring incessant lasting long-lasting neverending permanent persistent undying

momentary transient

impermanent temporal

lasting permanent

lengthy long-lived perpetual

ephemeral fleeting short-lived

fugacious passing short

enduring lasting lengthy long long-lived permanent perpetual

ephemeral temporary transient

brief evanescent fly by night fugacious impermanent passing temporal

enduring lasting permanent

lengthy long-lived perpetual