Example:My mother’s solemn expression told me she was not in a playful mood.
Trick to remember: Solo rahne wale solemn rahte hai.
Other meanings of Solemn
(adjective) Characterized by deep sincerity./ extremely somber or serious. — गंभीर/महत्त्वपूर्ण Example: Here was no humor in the principal’s solemn face as she talked about the consequences of school bullying.