彼は、彼女が幸せだと思いこんでいた。

Sentence Analyzer

彼女 幸せ 思いこんでいた

English Translation

He took it for granted that she was happy.

Furigana

(かれ)は、彼女(かのじょ)(しあわ)せだと(おも)いこんでいた。

Romanji

Kare wa, kanojo ga shiawase da to omoikondeita.

Words

(かれ)
he; him; his; boyfriend
()
topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
彼女 (かのじょ)
she; her; her; girlfriend; sweetheart
()
indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and
幸せ (しあわせ、しやわせ)
happiness; good fortune; luck; blessing
()
be; is; indicates past or completed action; indicates light imperative
()
if; when; and; with; particle used for quoting (with speech, thoughts, etc.); quoting particle; promoted pawn; indicates question (sentence end)
思い込む (おもいこむ)
to be under impression that; to be convinced that; to imagine that; to set one's heart on; to be bent on

Kanji

Readings: ヒ、 かれ、 かの、 か.の
Meanings: he, that, the
Readings: ジョ、 ニョ、 ニョウ、 おんな、 め
Meanings: woman, female
Readings: コウ、 さいわ.い、 さち、 しあわ.せ
Meanings: happiness, blessing, fortune
Readings: シ、 おも.う、 おもえら.く、 おぼ.す
Meaning: think