信頼 しんらいできる機能 きのうではありませんでした
shinrai dekiru kinōdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 信頼できる機能

1. Was not a reliable function.; Was not a dependable feature.

Past/Perfective
Negative
Polite
Formal Register
Computing