na-adjective, noun
constancy; immutability; unchanging
A somewhat formal or literary term for something that remains constant and does not change over time. Often used in philosophical or descriptive contexts.
不易流行という言葉は、変わらないものと変わるものの両方を大切にする考え方だ。
The phrase 'fueki ryūkō' represents the idea of valuing both the unchanging and the changing.
自
I was moved by the immutable beauty of nature.
From Chinese 不易 (bùyì), meaning 'not easy' or 'unchanging'. The Japanese reading ふえき is the on'yomi. The word is used in classical and literary Japanese.