不可欠

1. Origins, structure, and basic meaning

• Structure: 不可欠 is read ふかけつ and is an expression meaning essential and impossible to omit for a purpose.
• Basic usage: It is used for factors such as cooperation or water that are essential to a task or growth.

2. Common pitfalls and similar expressions

• Sentence patterns
  • Before a noun it appears as 不可欠な要素; predicatively it appears in forms such as 協力が不可欠だ.