研究 けんきゅう熱心 ねっしんではありませんでした
kenkyū nesshindewārimasendeshita

Desu Copula
na-Adjective

The polite, past negative form of 研究熱心

1. Was not enthusiastic about research.; Was not diligent in study.

Past/Perfective
Negative
Polite
Formal Register