効果 こうか抜群 ばつぐんではありませんでした
kōka batsugundewārimasendeshita

Noun
Desu Copula
na-Adjective
no-Adjective

The polite, past negative form of 効果抜群

1. Was not very effective.; Did not have a remarkable effect.

Past/Perfective
Negative
Polite
Formal Register