Translation

反応がよい / 対応が早い / 応答性のある

Meaning

Responsive describes someone or something that reacts quickly, helpfully, or appropriately to needs, requests, changes, or signals. It is about responding well, not being responsible for a duty.

Examples

• そのサポートチームは対応が早くて助かります。
  The support team is responsive and helpful.
• この車はハンドル操作への反応がよいです。
  This car feels responsive when you steer.