Dictionary.com
Thesaurus.com
Synonyms

fleeting

American  
[flee-ting] / ˈfli tɪŋ /

adjective

  1. passing swiftly; vanishing quickly; transient; transitory.

    fleeting beauty;

    a fleeting glance.

    Synonyms:
    fugitive, brief, flying, passing

fleeting British  
/ ˈfliːtɪŋ /

adjective

  1. rapid and transient

    a fleeting glimpse of the sea

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

  • fleetingly adverb
  • fleetingness noun
  • unfleeting adjective

Etymology

Origin of fleeting

First recorded in 1325–75; Middle English; fleet 2 + -ing 2