In a manner befitting a king or queen.

Extremely or very greatly.

अत्यंत या बहुत अधिक।

English Usage: They are royally mistaken if they think they can win.

Hindi Usage: यदि वे सोचते हैं कि वे जीत सकते हैं, तो वे पूरी तरह गलत हैं।