How to say "everlasting" in Japanese

• 不変ふへんCommon
  na-adjective, no-adjectiveCovers 'everlasting' in the sense of unchanging: something that remains the same forever, such as a truth, law, or principle. The emphasis falls on absence of change rather than on time itself.
  これ不変ふへんの真理しんりなり。↗

  This is an immutable truth.
• 不朽ふきゅうCommon
  no-adjective'Everlasting' in the sense of immortal or enduring: something that will not decay or fade away. It fits works, achievements, or fame that are meant to last forever.
  この数年間すうねんかんに彼かれは不朽ふきゅうの名詩めいしを書かいた。↗

  During these years he wrote immortal poems.
• 悠久ゆうきゅうCommon
  no-adjective, na-adjective'Everlasting' describing time itself as vast and unending: ages reaching back beyond memory and stretching on forever, as with the eternal universe or the flow of history. It evokes immense, distant spans of time.
• 果てしないはてしないCommon
  i-adjectivePrimarily 'endless; boundless': something that goes on and on with no end, like a boundless expanse or an endless wait. For eternal or immortal senses of 'everlasting' it is seldom the word you want.
  この果はてしない宇宙うちゅうにいるのは、私わたしたち人類じんるいだけですか？↗

  Are we humans alone in this infinite universe?

Choose 不変 for what never changes, 不朽 for what does not decay or fade (immortal works, fame), 悠久 for time itself stretching endlessly, and 「果てしない」 mainly for anything simply endless or boundless.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 不変ふへんeternal
• 不朽ふきゅうeverlasting
• 悠久ゆうきゅうeternal
• 果てしないはてしないendless
• 津々しんしんgushing
• 常磐ときわeverlasting
• 尽きないつきないeverlasting
• 千古不滅せんこふめつeverlasting
• 不朽不滅ふきゅうふめつeverlasting
• 常住不滅じょうじゅうふめつeverlasting
• 幾久しいいくひさしいeverlasting
• 末永いすえながいpermanent
• 尽きせぬつきせぬeternal
• 恒常的こうじょうてきconstant
• 絶え間ないたえまないincessant