思い込み

1. Origins, structure, and basic meaning

• Structure: The noun 思い込み (おもいこみ), from 思い込む, is an assumption or preconception held without adequate grounds.
• Basic usage: It can motivate a judgment in 思い込みで決めつける or be stated as 駅は近いという思い込み.

2. Common pitfalls and similar expressions

• An unsupported fixed assumption
  • It is a belief fixed in advance that can distort judgment, not a conclusion reached after adequate evidence.