In a manner that is extremely serious or urgent.

अत्यंत गंभीर या तात्कालिक तरीके से।

English Usage: The situation was direfully serious, requiring immediate action.

Hindi Usage: स्थिति अत्यंत गंभीर थी, तात्कालिक कार्रवाई की आवश्यकता थी।