Extremely joyful, elated

अत्यंत खुश

English Usage: She felt deliriously happy when she received the good news.

Hindi Usage: उसे अच्छी खबर सुनकर अत्यंत खुश महसूस हुआ।

In an extremely excited or happy manner

अत्यंत उत्साहित या खुश होकर

English Usage: He danced deliriously during the celebration.

Hindi Usage: उसने समारोह के दौरान अत्यंत उत्साहित होकर नाचा।