How to say "unforgettable" in Japanese

• 忘れがたいわすれがたい
  i-adjectiveCovers the core 'unforgettable; memorable' sense for people, scenes, or experiences that stay in the mind. Nuance is somewhat literary or formal, and it is less common than 忘れられない.
• 忘れられないわすれられない
  i-adjectiveThe most broadly usable word for 'unforgettable; memorable', including the 'haunting; indelible' nuance of experiences one cannot put out of mind. A safe default for describing memories, trips, or people.
  ここは、私わたしたちが初はじめて出会であった忘わすれられない場所ばしょだ。↗

  This is the unforgettable place where we met each other for the first time.
• 忘れ得ぬわすれえぬ
  prenominal modifierMeans 'unforgettable' but is a literary, old-fashioned form; not an everyday way to say it. Suits written, poetic, or narrative prose rather than ordinary conversation.
• 忘れもしないわすれもしない
  expression, i-adjectiveSeldom the word you want for 'unforgettable': it really means one lucidly, vividly remembers something and emphatically has not forgotten it, as in recalling a past event clearly.

「忘れられない」 is the most versatile choice for 'unforgettable'; 「忘れがたい」 is close but less common; 「忘れ得ぬ」 is literary; 「忘れもしない」 really means one vividly remembers something rather than calls it unforgettable.

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

• 忘れがたいわすれがたいunforgettable
• 忘れられないわすれられないunforgettable
• 忘れ得ぬわすれえぬunforgettable
• 忘れもしないわすれもしないunforgettable