慢心

1. Origins, structure, and basic meaning

• Structure: 慢心 is read as まんしん and is a noun and する verb for conceit or complacency that follows excessive confidence and relaxed vigilance.
• Basic usage: Growing complacent after one success appears in 成功で慢心する, while warning players against it appears in 慢心を戒める.

2. Common pitfalls and similar expressions

• State and warning target
  • Use 慢心する for becoming complacent and 慢心を戒める for warning against that attitude.
• Difference from 自信
  • Unlike positive confidence in one’s ability, this term negatively describes overconfidence that leads to carelessness.