"Thank you" or its equivalent in several Indian languages... Sanskrit, Hindi, Gujarati, Tamil.

Let me try first (gotta love the internet)...

Sanskrit: Anugurihiitosumi
Hindi: Dhanyawaad.
Gujarati: Aabhar or Dhanyawaad.
Tamil: Nandri, or Nangreeih, or Romba nanringa, or Rumba nandri.

Stress accents are missing though.

What's proper, when?