興味

1. Origins, structure, and basic meaning

• Structure: 興味 (きょうみ) means interest that prompts a desire to know more. 興味がある is an existing state; 興味が深まる is an increase.
• Basic usage: Interest in star movement has existed since childhood; an exhibition later deepens interest in ancient writing.

2. Common pitfalls and similar expressions

• Sustained interest and interest strengthened by experience
  • The target connects through に or への. ある presents a state, while 深まった presents a change in degree.