N1
ならいざ知らず
Don't know about it, Maybe it would or might be possible for
自領
で
やる
なら
いざ
知ら
ず
。
The stakes are different if you're going to do it in your own territory, but outside of that I don't know / I couldn’t care less.
好き
な
女の子
と
なら
いざ
知ら
ず
。
"As for someone other than the girl I like, I have no idea (what she might do / how she might feel)."
陛下
が
前線
に
いる
なら
いざ
知ら
ず
“Unless His Majesty is right there on the front line—don’t even talk about it.”
(Nuance: “I can’t agree/approve unless His Majesty himself is on the front line.”)
彼
なら
いざ
知ら
ず
、
私
で
は
その
試験
に
は
合格
でき
っこ
ない
。