A Hindi Phrase for Celebrating Diwali: "दिवाली की हार्दिक शुभकामनाएँ!"

"दिवाली की हार्दिक शुभकामनाएँ!" means "Happy Diwali!" and it's the basic Hindi expression used for celebrating Diwali. It's very handy at celebrations and holidays. To answer, you can say something like "आपको भी दिवाली की बहुत-बहुत बधाई!" (Happy Diwali to you too!). You can keep the conversation going by reacting with something like "आपका घर खुशियों से भरा रहे।" (May your home be filled with happiness).