everlasting · perpetual · lasting · forever · permanent

President Kennedy was killed, but his legend will live on forever.

In order to deal with repeat offenders, Mr Johnson is also establishing a "two strikes and you're out" policy - serious breaches of the rules will result in permanent removal of free travel rights.

Please give me your permanent address.

As transplants to Southern California, the red-crowned parrots have become such permanent fixtures that they are on the California Bird Records Committee’s list of birds in the state.

Alert, in Nunavut, Canada, is the northernmost permanently inhabited place in the world.