Is it safe to connect ArmoryDB to a potentially untrusted bitcoind node?
ArmoryDB requires a local Bitcoin node and it must read the block files directly from the disk, so it isn't possible to connect to an untrusted bitcoind, unless you don't trust yourself.
Or ArmoryQt to a potentially untrusted ArmoryDB server?
AFAICT, your Bitcoin would still be safe, but not your privacy.