研究 けんきゅう熱心 ねっしんじゃありませんでした
kenkyū nesshinjārimasendeshita

Desu Copula
na-Adjective

The polite, past negative form of 研究熱心

1. Was not enthusiastic about research.; Was not diligent in research.; Was not keen on research.

Past/Perfective
Negative
Polite
Terminal Form