màn​màn

endless

漫漫 màn​màn
endless descriptive
long and seemingly without end, especially regarding time or a path

During this long, long night, he kept thinking about his future direction.

boundless descriptive
vast and extensive, covering a wide area without visible limits

The vast stretches of yellow sand surged in the gale, a truly magnificent sight.

Frequency

Movie subtitles
3.76 per million appears in 2% of films
Written text
4.09 per million

Sources

Definitions
CC-CEDICT