adjectival noun or quasi-adjective

  1. overly serious, serious to a fault, humorless.

Variations

Pronunciation Kanji Kana Is Common
 
 
クソ真面目 クソまじめ
 
 
くそ真面目 くそまじめ
糞真面目 くそまじめ
 
 
 
糞マジメ くそマジメ
 
 
 
糞まじめ くそまじめ
 
 
 
 
 
クソマジメ

Contained Kanji Breakdown

true, reality, Buddhist sect
シン ま まっ (3rd, N4)
ten
ジュウ ジッ ジュッ (1st, N5)
tool, utensil, means
グ そな.える つぶさ.に (3rd, N3)
daybreak, dawn, morning
タン あき.らか あきら (Late High School, N1)
day, sun, Japan
ひ にっ ニチ (1st, N5)
one, one radical (no.1)
イチ いっ ひと- (1st, N5)
eight, eight radical (no. 12)
ハチ や はっ (1st, N5)
mask, face, features
メン おも つら (3rd, N3)
cliff, (厂 variant)
to turn around, to return, to go back
box, box or enclosure radical (no. 31)
イ コク (Kentei 1)
eye, class, look
め モク ボク (1st, N4)
eye, class, look
め モク ボク (1st, N4)