幻滅

1. Origins, structure, and basic meaning

• Structure: 幻滅 is read as げんめつ and is a noun or する verb for disillusionment when reality breaks an ideal or expectation.
• Basic usage: Someone may 幻滅する after seeing conduct or 幻滅を覚える at a gap between ideal and reality.

2. Common pitfalls and similar expressions

• Trigger and cause
  • 行動を見て presents what triggered the reaction, while 差に points to the gap producing it.
• More than brief disappointment
  • The central nuance is the collapse of a previously favorable image or belief.