na-adjective, noun which may take the genitive case particle 'no', noun
immortal; undying; indestructible
Describes something that cannot die, be destroyed, or fade away. Used for abstract concepts such as fame, spirit, or legacy, as well as mythical beings. Often appears in the phrase 不滅の.
彼の功績は不滅のものとなった。
His achievements became immortal.
不滅の魂を信じる人もいる。
Some people believe in an immortal soul.
Compound of 不 (ふ, 'not') and 滅 (めつ, 'perish' or 'be destroyed'). The kanji combination directly yields the meaning 'imperishable' or 'indestructible'.