乐此不疲 lècǐ-bùpí to enjoy something and never tire of it
(idiom) to enjoy something and never tire of it
How to remember 乐此不疲: 乐 cheerful + 此 this + 不 not + 疲 weak = to enjoy something and never tire of it.
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How it is used
- To never tire of doing something you love - 他研究昆虫，乐此不疲 (tā yánjiū kūnchóng, lècǐ-bùpí) he studies insects tirelessly, never bored of it.
- Describes absorbed, willing repetition of a hobby or task; the tone is admiring or gently amused.
- 此 (cǐ, this) points back to the activity just mentioned, so it usually follows a stated action.