瞞着 まんちゃく手段 しゅだんではありませんでした
manchakushudandewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 瞞着手段

1. Was not a deceptive tactic.; Was not a means of concealment.

Past/Perfective
Negative
Polite
Formal Register