思い込む

Meaning

1. v5mvi
   to be convinced (that); to be under the impression (that); to feel sure (that); to assume (that)
2. v5mvi
   to make up one's mind; to set one's heart on; to be determined (to do); to be bent on
3. v5mvi
   to be obsessed (with a thought, idea, etc.); to think about obsessively

Example sentences

• 彼女は彼が無罪だと思い込んでいる。

  She presumes him to be innocent.

• 彼女は私が彼女の悪口を言っていると思いこんでしまった。

  She got it into her head that I was bad-mouthing her.

• 彼は自分が病人だと思い込んでいる。

  He fancies himself ill.