Difference between 尽くす and きれる


I know both 尽くす and きれる mean to do something fully/completely eg(these are my
own examples)

> 色々やり尽くす。(I have tried all the methods or I have exhausted all the methods.)

generally I have heard of

> 食べきれない。(cannot complete the food...)

What I want to know is when do we use 尽くす and きれる.

How do I know if I can say やり尽くす or やりきれる?




It's an explanation by feeling rather than logic, but **V+きる** strikes me as
if pushing a progress bar until the end, while **V+つくす** marking off all items
in a list one by one. People use ～きる when you achieved 100% of an assumed
entirety of work needed to call it completed, and ～つくす, when you leave none of
ever imaginable targets.

That's why ～きる is typically associated with a goal, or "the point you don't
have to continue" (especially in potential form ～きれる), and ～つくす against
available resource, or "the point you have no means to continue". In another
aspect, ～きる usually focuses on a single item or event, where ～つくす has multiple
items in mind.

They sometimes have a complex interaction with the verb's meaning (besides
many non-transparent idioms e.g. 乗り切る, 張り切る etc.) that I can't really make a
sweeping summary, but hope you grasp a feel from examples below:

> やりきる (do a single thing to the end)  
>  やりつくす (do every possible thing; try every possible way)
>
> 食べきる (eat until 0% left / to do) ≈ 食べつくす (eat until nothing remains)
>
> ○ 疲れきる (so tired that HP down to 0)  
>  × 疲れつくす (it's difficult to assume some kind of "fatigue" list)
>
> 一本の木を使いきる (use a piece of lumber completely)  
>  一本の木を使いつくす (make full use (every possible application) of a piece of
> lumber)




It's an explanation by feeling rather than logic, but **V+きる** strikes me as
if pushing a progress bar until the end, while **V+つくす** marking off all items
in a list one by one. People use ～きる when you achieved 100% of an assumed
entirety of work needed to call it completed, and ～つくす, when you leave none of
ever imaginable targets.

That's why ～きる is typically associated with a goal, or "the point you don't
have to continue" (especially in potential form ～きれる), and ～つくす against
available resource, or "the point you have no means to continue". In another
aspect, ～きる usually focuses on a single item or event, where ～つくす has multiple
items in mind.

They sometimes have a complex interaction with the verb's meaning (besides
many non-transparent idioms e.g. 乗り切る, 張り切る etc.) that I can't really make a
sweeping summary, but hope you grasp a feel from examples below:

> やりきる (do a single thing to the end)  
>  やりつくす (do every possible thing; try every possible way)
>
> 食べきる (eat until 0% left / to do) ≈ 食べつくす (eat until nothing remains)
>
> ○ 疲れきる (so tired that HP down to 0)  
>  × 疲れつくす (it's difficult to assume some kind of "fatigue" list)
>
> 一本の木を使いきる (use a piece of lumber completely)  
>  一本の木を使いつくす (make full use (every possible application) of a piece of
> lumber)

