known to only few people in English:

Nowadays, the fourteenth century's debate about the Eucharist sounds completely arcane.

More arcane means may be needed to find a true name. To people not involved in health care, the issue can appear arcane. Well there's a lot, but it gets kind of arcane pretty quickly.

The professor is an expert in arcaneKashubian literature.

beyond the arcane world of balletomanes

EnglishBut I also wanted to follow the hundreds of arcane and obscure laws that are in the Bible. EnglishWe have even managed to make the study of literature arcane.

The arcane attitude of the FBI must be dealt with soon - we need more openess in government, not less.