na-adjective
Used to describe something in terms of quality rather than quantity. Often contrasted with 量的 (quantitative).
この研究では、質的な分析が重要だ。
In this research, qualitative analysis is important.
量的な変化だけでなく、質的な変化にも注目すべきだ。
We should pay attention not only to quantitative changes but also to qualitative changes.