This is the 7249th most frequent Japanese word.
不滅
"Immortality" or "indestructibility."
In this sentence, '不滅' (eternal) is used to describe the enduring and timeless nature of '友情' (friendship). It emphasizes the undying and unbreakable aspect of the bond.
不滅の友情は時代を超えて続きます。
Eternal friendship transcends time and continues.
The word '不滅' (immortal) here refers to the everlasting recognition or renown that certain figures have achieved within the scope of history.
歴史の中で不滅の名声を築いた人物がいます。
There are individuals who have established immortal fame in history.
In this instance, '不滅' (eternal) illustrates the perpetual and undying significance that his works have in the realm of art.