Na-adjective (keiyodoshi), Noun
sentimental
花火の弾ける音が止むと、急に辺りが静かになる。後に残った火薬の匂いが、なんだか俺をセンチメンタルな気分にさせた。As the popping sound of the fireworks stopped, it suddenly became quiet around me. The smell of gunpowder somehow put me in a sentimental mood.
Also written センティメンタル