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
Example Sentences
I caught a fleeting glimpse of the comet. had a fleeting desire to jump into the cool lake but kept on hiking
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