勉強 べんきょう熱心 ねっしんではありませんでした
benkyō nesshindewārimasendeshita

Desu Copula
na-Adjective

The polite, past negative form of 勉強熱心

1. Was not diligent.; Was not enthusiastic about studying.

Past/Perfective
Negative
Polite
Formal Register