endless
Definitions
Having no limit or end; infinite.
Continuing for a long time in a way that seems to have no conclusion.
Having the ends joined together to form a continuous loop.
Examples
The hikers were mesmerized by the endless expanse of the desert horizon.
She felt like she was trapped in an endless cycle of repetitive tasks at work.
The children had endless energy as they ran around the park all afternoon.
Synonyms
ceaseless eternal infinite perpetual everlasting interminable boundless