A serious or sober person, often used to describe someone who is not inclined towards frivolity or lightheartedness.

गंभीर व्यक्ति

English Usage: "He was known as the sobersides of the group, always focusing on the work rather than the fun."

Hindi Usage: "वह समूह का गंभीर व्यक्ति था, हमेशा काम पर ध्यान केंद्रित करता था बजाय मजे के।"