堅忍 けんにん持久 じきゅうじゃなかったです
kenninjikyūjanakattadesu

Noun
Desu Copula

The polite, past negative form of 堅忍持久

1. Wasn't persistent.; Wasn't steadfast.; Wasn't persevering.

Past/Perfective
Negative
Polite
Casual Register