endless

/ˈɛndləs/
adjective
  1. Having no end; seeming to continue forever.
    • The children's endless energy amazed their parents.
    • She complained about the endless meetings at work.
    • The desert seemed endless under the blazing sun.
  2. Extremely numerous or long; very great in amount or duration.
    • The movie felt endless, even though it was only two hours.
    • There are endless possibilities for what you can do with this recipe.
    • He faced an endless list of chores before the party.
  3. Forming a continuous loop or circle with no beginning or end.
    • An endless chain of gears powered the old machine.
    • The track was an endless circuit for the toy train.
    • The conveyor belt moved in an endless loop.