The adjective ephemeral means something that lasts only for a very short period.
Synonyms are momentary, fleeting, brief, or temporary.
The word origins from 1560s. It comes from ephemera meaning “short-lived” plus –al. It is originally used for diseases and lifespans to mean “lasting but one day.” The extended sense of “transitory” is from 1630s.
The ephemeral ponds usually evaporate in the course of the summer.
This painting may be costly now but it has only ephemeral value.
She scorned at how ephemeral his love is!