fleet·ing 
/ˈfli:tɪŋ/ adjective
/ˈfli:tɪŋ/ adjective [more fleeting; most fleeting] : not lasting : lasting for only a short time
▪ autumn's fleeting beauty ▪ I caught a fleeting glimpse of the comet. ▪ Her fame was fleeting.
▪ autumn's fleeting beauty ▪ I caught a fleeting glimpse of the comet. ▪ Her fame was fleeting.
