クソ真面目

クソまじめ, くそまじめ, くそマジメ, クソマジメkusomajime

na-adjective

  1. overly serious
  2. serious to a fault
  3. humorless

Kanji in this word

Study it in Yanamino

Data from JMdict, KANJIDIC2 (EDRDG), KanjiVG, CC-CEDICT and Make Me a Hanzi. Sources and licences