Solemn or thoughtful; not joking.

गंभीर

English Usage: She has a serious expression on her face.

Hindi Usage: उसके चेहरे पर गंभीर मनःस्थिति है।

The quality or state of being serious.

गंभीरता

English Usage: The seriousness of the situation cannot be ignored.

Hindi Usage: स्थिति की गंभीरता को नजरअंदाज नहीं किया जा सकता।

In a serious manner; not jokingly.

गंभीरता से

English Usage: He is seriously considering the proposal.

Hindi Usage: वह प्रस्ताव को गंभीरता से विचार कर रहा है।