不衰

bùshuāi
  1. unfailing
  2. never weakening
  3. enduring
  4. unstoppable

CEDICT

  1. 不竭、不尽。
  2. 不停止、不中辍。

重編國語辭典

Entry Composition

1 不 bù
  1. no; not so
  2. (bound form) not; un-
2 衰 shuāi (bound form) to decay; to decline; to wane

Containing this entry

经久不衰 jīngjiǔbùshuāi
  1. unfailing
  2. never-ending
历久不衰 lìjiǔbùshuāi

Related entries

经久不衰 jīngjiǔbùshuāi
  1. unfailing
  2. never-ending
持久 chíjiǔ
  1. lasting
  2. enduring
  3. persistent
  4. permanent
  5. protracted
  6. endurance
  7. persistence
  8. to last long
生活中绝对没有什么是持久的。

Absolutely nothing is permanent in life.

Source: Tatoeba

锐不可当 ruìbùkědāng
  1. unstoppable
  2. hard to hold back
如火如荼 rúhuǒrútú
  1. like wildfire (idiom)
  2. unstoppable