うんちくじゃなかったです
蘊蓄じゃなかったです
unchikujanakattadesu

Noun
Desu Copula

The polite, past negative form of うんちく

1. Didn't accumulate; Didn't have; Didn't possess

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana