noun, noun which may take the genitive case particle 'no'
Used for lasting, unchanging states, often in formal or abstract contexts such as peace, treaties, or principles.
We wish for lasting peace.
This treaty aims for a permanent solution.
The government is looking for a permanent solution to this problem.
The international community is cooperating to achieve lasting peace.
不変 means something does not change, while 恒久 means something is long-lasting or permanent, often used for peace or institutions.
恒久 is a formal term for lasting permanence, often used in phrases like 恒久平和 (lasting peace), while 悠久 evokes the vast, poetic sweep of time itself.
permanent and immutable; eternally unchanging
permanent measure; long-term solution
permanent establishment (tax law)