The way I used to remove old and large databases that would take ages to delete via cypher was simply deleting its folder (inside data folder, both database and transaction).
For obvious reasons I recommend you back up the folder before deleting it.
Hmm, that's really strange. Mine was totally wiped out from the system when I did this, not even showing up on cypher-shell. What installation are you using? Docker, Bitnami, Neo4j-Desktop?