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The Hollywood term for film recorded without synchronous audio is MOS.

One of the many alleged origins for the term is a German director (which director varies according to the story) declaring that a scene should be shot "mit out sound".

Anthony Burgess, who wrote English dialogue for Italian movies--whether for subtitles or dubbing I forget--said that Fellini had his cast say sequential numbers; that way, he could just order them to start again from 10. I do recall seeing someone credited with Michel Piccioli's lines on an Austrian film.

I don’t (just) mean with regards to audibility but also lip sync and intonation. It depends on the original language of course. The lip sync in squid game was noticeably off for example (Watched it with my family who dont like subs).