Synonyms and related words :
annual, biannual, biennial, bimonthly, biweekly, brief, brittle, capricious, catamenial, centenary, centennial, changeable, corruptible, daily, decennial, deciduous, diurnal, dying, ephemeral, evanescent, fading, fickle, fleeting, flitting, fly-by-night, flying, fortnightly, fragile, frail, fugacious, fugitive, hasty, hebdomadal, hourly, immediate, impermanent, impetuous, impulsive, inconstant, instant, instantaneous, insubstantial, lightning-like, menstrual, momentaneous, momently, monthly, mortal, mutable, nondurable, nonpermanent, passing, perishable, presto, quarterly, quick, quick as lightning, quick as thought, quotidian, secular, semestral, semiannual, semimonthly, semiweekly, semiyearly, short, short-lived, temporal, temporary, tertian, transient, transitive, transitory, triennial, undurable, unenduring, unstable, volatile, weekly, yearly