万世不易

ばんせいふえき

eternity, perpetuity

万代不易

ばんだいふえき

eternity, perpetuity

千古不易

せんこふえき

eternally unchanging

不易流行

ふえきりゅうこう

the principle of fluidity and immutability in haiku, Haiku is both "fluid and transitory" and "eternal and immutable.", An interchange between the transient and the immutable is central to the soul of haiku. (Basho)

万古不易

ばんこふえき

eternally unchanging

易

えき い

easiness

容易

ようい

easy, simple, plain

貿易

ぼうえき

trade (foreign)

辟易

へきえき

to wince, to shrink back

簡易

かんい

simplicity, convenience, easiness, quasi-

易い

やすい

easy

安易

あんい

easy, simple

交易

こうえき

trade, commerce

易経

えききょう えきけい

I Ching (Yi Jing) or The Book of Changes - one of the Five Classics

易断

えきだん

divination, fortunetelling

易き

やすき

easiness, simpleness

易簀

えきさく

the death of a scholar

改易

かいえき

change of rank

易化

simplification; facilitation; becoming easy