transient

/ˈtɹænʒənt/

lasting only for a short time; impermanent

transient in a sentence

“The transient nature of youth is often lamented.”

Latin transire to go across, pass from trans- across + ire to go

Related Words

fleeting

lasting for a very short time

evanescent

soon passing out of sight, memory, or existence

momentary

lasting for a very short time; brief

perpetual

never ending or changing; occurring repeatedly

perennial

lasting for an indefinite time; enduring

immutable

unchanging over time or unable to be changed