fleeting

transient, transitory, ephemeral, momentary, fugitive, fleeting, evanescent mean lasting or staying only a short time. transient applies to what is actually short in its duration or stay. a hotel catering primarily to transient guests transitory applies to what is by its nature or essence bound to change, pass, or come to an end. fame in the movies is transitory ephemeral implies striking brevity of life or duration. many slang words are ephemeral momentary suggests coming and going quickly and therefore being merely a brief interruption of a more enduring state. my feelings of guilt were only momentary fugitive and fleeting imply passing so quickly as to make apprehending difficult. let a fugitive smile flit across his face fleeting moments of joy evanescent suggests a quick vanishing and an airy or fragile quality. the story has an evanescent touch of whimsy that is lost in translation