Meaning and Usage
The verb 思い込む (おもいこむ) means "to be convinced that" or "to be under the impression that." It often implies a strong belief or assumption, sometimes without sufficient evidence. This can be positive or negative depending on context.
Common Contexts
It is frequently used when someone firmly believes something to be true, even if it might be mistaken. For example, thinking you are right, or assuming someone is angry without confirmation.
Collocations and Patterns
- 思い込む + ことがある: to have the experience of being convinced
- 〜と思い込む: to be convinced that ~
- 強く思い込む: to be strongly convinced
Register and Nuance
This verb is neutral in formality and can be used in both spoken and written Japanese. It often carries a nuance of a mistaken or unverified belief, so be careful not to confuse it with 確信する (to be certain).
Common Mistake
Learners sometimes confuse 思い込む with 思う (to think) or 信じる (to believe). 思い込む stresses a firm, sometimes stubborn conviction, often without proof. Use it when you want to express that someone is deeply convinced or has made up their mind about something.