noun
- a serious, humorless, or overly solemn person
Usage: informal; often used disapprovingly
Examples
- Don’t be such a sobersides – it’s just a harmless prank.
- The office sobersides complained about the birthday decorations.
- She’s turned into a real sobersides since becoming manager.
- Even at the party, he remained a sobersides, criticizing the music.
- The children called their strict teacher ‘old sobersides.’
- His reputation as a sobersides made him unpopular at social events.