Words To Describe Transience

adjective tending to vanish like vapor; fleeting; transient

• The evanescent nature of the morning dew made it a challenge to capture in photographs.
• The evanescent beauty of the sunset took my breath away.
• That party was so evanescent, I can barely remember what happened.
• Her evanescent smile left a lasting impression on everyone in the room.

adjective a word that describes or modifies a noun, in this case, insubstantial describes something that lacks substance or solidity

• The evidence presented in court was deemed insubstantial and insufficient to convict the defendant.
• I don't think we should trust him, his promises seem insubstantial.
• That excuse is so insubstantial, it's laughable.
• Her dreams felt insubstantial, like they were made of air and could easily slip away.