How to Say "Eternal" in Japanese

永遠の

eien no

The English word "eternal" can be translated into Japanese as 永遠の (eien no) or 永久の.

Meaning: lasting forever (adj)

Ways to say it

“eternal” in Japanese
Japanese	Romanization (Wiktionary)
永遠の	eien no
永久の	eikyū no

Both forms describe something that lasts forever.

The base noun 永遠 (eien) means "eternity" or "perpetuity."

The form 永遠の (eien no) uses the particle 《の》 to function as an adjective that modifies a noun.

eien no

In Buddhist-influenced Japanese, the concept of eternity is often linked to 無常 (mujou), which actually means 'impermanence', suggesting that true eternity is understood through the lens of change.
The character 永 (ei) in 永遠 is a pictograph of a long, winding river, symbolizing a flow that stretches out indefinitely.
The word 永久 is used in the term 永久欠番, which refers to a retired jersey number in sports that can never be worn by another player.

永遠の愛なんてあるわけないじゃん。
Eternal love doesn't exist.
Tatoeba #3591603 by tommy_san, translation #3621377 by gaialoro
太陽は光と熱と生命の永遠の源です。
The sun is the eternal source of light, heat, and life.
Tatoeba #4744205 by User61587, translation #4828649 by salpfish
私は永遠のPC初心者です。
I am an eternal PC-newbie.
This sentence shows how 永遠の can be used sarcastically to describe a lifelong beginner.
Tatoeba #503984 by xtofu80, translation #504623 by blay_paul
彼らは永遠の愛を誓いました。
They pledged eternal love.
あの日の思い出はとこしえに私の心に刻まれています。
The memories of that day are eternally engraved in my heart.
彼女の美しさは永遠のものです。
Her beauty is eternal.
この思い出はとこしえに私の心に残ります。
This memory will remain in my heart eternally.
1 more sentence on Tatoeba

Kenta and Misaki are looking at a beautiful sunset together.

美咲 Misaki

この景色を永遠の思い出にしたいね。
Kono keshiki o eien no omoide ni shitai ne.
I want to make this scenery an eternal memory.
健太 Kenta

そうだね。本当にきれいだ。
Sou da ne. Hontou ni kirei da.
You're right. It's truly beautiful.
美咲 Misaki

永遠の愛があるなら、信じたいな。
Eien no ai ga aru nara, shinjitai na.
If eternal love exists, I want to believe in it.
健太 Kenta

俺は美咲のことをずっと大切にするよ。
Ore wa Misaki no koto o zutto taisetsu ni suru yo.
I will always cherish you, Misaki.

Sources

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