momentary

equivalents

short

synonyms

annual

biannual

biennial

bimonthly

biweekly

brief

brittle

capricious

catamenial

centenary

centennial

changeable

corruptible

daily

decennial

deciduous

diurnal

dying

ephemeral

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

same-contexts

brief

continual

fleeting

inward

mental

profound

sudden

temporary