adjectival noun or quasi-adjective, takes genitive case の, noun

  1. unfaithfulness, infidelity, unchastity.

Variations

Pronunciation Kanji Kana Is Common
不貞 ふてい

Contained Kanji Breakdown

negative, non-, bad
 (4th, N4)
cliff (厂) variant
divining, fortune-telling, divination or katakana to radical (no. 25)
ボク うらな.う うらない (Kentei Pre-1)
upright, chastity, constancy
テイ さだ ジョウ (9th, N1)
divining, fortune-telling, divination or katakana to radical (no. 25)
ボク うらな.う うらない (Kentei Pre-1)
shellfish
かい バイ (1st, N2)
eye, class, look
め モク ボク (1st, N4)
eight, eight radical (no. 12)
ハチ や はっ (1st, N5)