Answer:
A lust for the flesh. A desire for things in the world. Things that the flesh pulls your clean spirit to.
Inordinate affection is the opposite of proper affection.
Inordinate affection may manifest as lust for one that should not receive our affection, which Bible teachers may link to soul ties.
Inordinate affection may also take the form of unquestioning support for one who teaches error. See "Agape" - God's Love, Versus Inordinate Affection, by John G. Lake