IPA: /ˈsoʊbərˌsaɪdz/
KK: /ˈsoʊbərˌsaɪdz/
A person who is serious and does not show much emotion or humor.
Despite the festive atmosphere, he remained a sobersides throughout the party.
Sobersides is formed from "sober" (from Old French *sober*, meaning temperate or moderate) and "sides" (from Old English *side*, meaning a part or aspect). The word refers to a person who is serious or grave, emphasizing the aspect of sobriety.
Think of someone who is 'temperate' or 'moderate' ('sober') and has a serious 'aspect' or 'part' ('sides') to their personality. This helps you remember that a sobersides is someone who is serious or grave.