固執

1. Origins, structure, and basic meaning

• Structure: 固執, read こしつ here, means stubbornly holding to one's view or method.
• Basic usage: It is used for clinging to an old approach or one's position instead of accepting alternatives.

2. Common pitfalls and similar expressions

• Tone compared with こだわる
  • こだわる can also describe a positive commitment to materials or quality. 固執する more strongly suggests a negative judgment about being unwilling to change and holding on too tightly.