solemn occasion or event

formal or ceremonial

गंभीर अवसर

English Usage: The solenne ceremony was attended by many dignitaries.

Hindi Usage: गंभीर समारोह में कई विशिष्ट व्यक्ति उपस्थित थे।

deeply serious or earnest

गंभीरता से

English Usage: His solenne demeanor indicated the seriousness of the situation.

Hindi Usage: उसकी गंभीरता से चेहरा स्थिति की गंभीरता को दर्शाता था।