Synonyms of 'evanescence'
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The brevity of something is the fact that it is short or lasts for only a short time.
The bonus of this homely soup is the brevity of its cooking time.
If you talk about the transience of a situation, you mean that it lasts only a short time or is constantly changing.
the superficiality and transience of the club scene
Thesaurus for evanescence from the Collins English Thesaurus
a gradual disappearance