I think he means "ingenious"
I once listened to Isengard and I think they were fine. But don't know anymore...
What I cannot understand is why Ulver, that are really talented musicians who can play their instruments and can sing like hell produce those 2 extra-ingenious albums "Bergtatt" and "Kveldssanger" and then do some badly-produced rubbish like "The Madrigal Of Night". Cannot understand..