wú​sǔn

intact

无损 (無損) wú​sǔn
intact idiom
remaining whole, undamaged, or doing no harm to something
lossless verb
relating to data compression or transmission without loss of information

I downloaded a losslessly compressed audio file.

Frequency

Movie subtitles
1.58 per million appears in 1% of films
Written text
1.62 per million

Sources

Definitions
CC-CEDICT