noun, noun which may take the genitive case particle 'no'
Refers to the state of never dying, often in mythological, philosophical, or fantasy contexts. Can be used as a noun or with の to modify another noun.
不死の伝説は多くの文化に存在する。
Legends of immortality exist in many cultures.
彼は不死の薬を探し求めた。
He sought the elixir of eternal life.
noun, noun which may take the genitive case particle 'no'
undeath; undead
Used in RPGs and fantasy settings to refer to the state of being undead or to undead creatures. Often appears in compound terms like 不死者 (undead being).
このゲームでは、不死のモンスターが夜に現れる。
In this game, undead monsters appear at night.
不死の王を倒すのがクエストの目的だ。
Defeating the undead king is the quest objective.
不死身 means 'invulnerable' or 'immortal body,' emphasizing physical invincibility, while 不死 refers more abstractly to the state of immortality or undeath.
永遠の命 is a more literal and common phrase for 'eternal life,' whereas 不死 is a compact term often used in fixed expressions or fantasy contexts.
Compound of 不 (not) and 死 (death), literally 'no death.' The concept appears in classical Chinese texts and was adopted into Japanese with the same meaning.