瞞着 まんちゃく手段 しゅだんじゃなかったです
manchakushudanjanakattadesu

Noun
Desu Copula

The polite, past negative form of 瞞着手段

1. Wasn't concealing it.; Wasn't using deceptive methods.; Wasn't hiding it.

Past/Perfective
Negative
Polite
Casual Register