脆弱

1. Origins, structure, and basic meaning

• Structure: 脆弱, read ぜいじゃく, means vulnerable or fragile in relation to a threat or problem.
• Basic usage: It describes a wall or weak parts of communications equipment.

2. Common pitfalls and similar expressions

• What something is vulnerable to
  • 地震の揺れに対して脆弱だ means vulnerable to earthquake tremors.
• Noun modification
  • 脆弱な部分 means vulnerable parts.
  • It takes な before a noun.