効果 こうか抜群 ばつぐんじゃないです
kōkabatsugunjanaidesu

Noun
Desu Copula
na-Adjective
no-Adjective
Negation Auxiliary

The polite negative form of 効果抜群

1. It's not very effective.; It doesn't work well.

Negative
Polite
Casual Register