Ephemeral (adjective) – lasting for a very short time

(Pronounced air-fem-uh-ruhl)

To remember the definition of the word ephemeral, use the following mnemonic:

They were offering a free emerald (ephemeral) with every purchase, but the deal lasted for a very short time.

Examples of ephemeral (adjective) in a sentence

His acting career was ephemeral.

She was a miserable old woman, any sign of joy was ephemeral at best. 

For an ephemeral moment they thought he'd actually changed his ways.