neither arising nor ceasing; unborn and undying
Buddhist term describing the ultimate nature of reality, beyond birth and death. Often contrasted with 生滅 (arising and ceasing).
See also: 生滅
不生不滅は仏教の根本的な教えの一つです。
Neither arising nor ceasing is one of the fundamental teachings of Buddhism.
From Buddhist terminology, combining 不 (not) with 生 (arise) and 滅 (cease). The exact historical derivation is uncertain; the spelling is conventionally associated with the concept of the unborn and undying nature of reality.