めんじゅうふくはい
pretending to obey but secretly betraying (someone)
Noun
文句もんくがあるならはっきり言いえよ。君きみのその態度たいどは面従腹背めんじゅうふくはいそのものだよ。
If you have a complaint let me hear it. There's a difference between superficial obedience and honest loyalty you know.