恒久

1. Origins, structure, and basic meaning

• Structure: 恒久 (こうきゅう) means lasting without expected change. It appears in an adjectival form and in literary 恒久の.
• Basic usage: A permanent bridge replaces a temporary one; engraved words wish for lasting peace.

2. Common pitfalls and similar expressions

• Permanent infrastructure and enduring peace as an ideal
  • 恒久的な橋 concerns planned durability; 恒久の平和 is aspirational permanence. Neither guarantees literal eternity.