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JLPT N2EverydaySpoken and written

甲斐かいがある・甲斐かいがないworth the effort; all for nothing

甲斐かい is what you get back for an effort. With ある, it paid off: worth the work, the wait or the trip. With ない, it was all for nothing. People say it every day.

How to form it

た-form + 甲斐かいがある・ない / Noun + の + 甲斐かいがある・ない

待まった甲斐かい, 努ど力りょくの甲斐かい. Often written かい. It looks back on what was done, so it is mostly in the past: 甲斐かいがあった, 甲斐かいがなかった.

As a suffix

Verb ます-stem + がい

やります → やりがい. A few are everyday words, listed below.

Before it
What you put in: 努ど力りょくした, 練れん習しゅうした, 待まった, 来きた. Or a noun for it: 努ど力りょく, 苦く労ろう, 応おう援えん.
After it
甲斐かいがあって、… goes on to the good result. In writing also 甲斐かいがあり.
Where you'll meet it
Conversation and writing alike.

In use

甲斐かいもなく: in vain

甲斐かいもなく opens the bad news: the effort was made, and it did no good. It is common in news and novels.

やりがい, 生いきがい: the がい words

On a ます-stem, がい makes a noun for the reward you feel in doing something.

やりがいthe sense that a job is worth doing

This job is hard, but it's rewarding.

生いきがいwhat you live for

Playing with his grandchildren is what my grandfather lives for.

働はたらきがいsatisfaction in your work

I care more about finding my work rewarding than about the pay.

Close neighbours

おかげでN3

"Thanks to": it credits a person, a thing or a piece of luck. 甲斐かい is for an effort, and says it was worth making.

だけのことはあるN2

Starts from the result: it is as good as the effort, the price or the name led you to expect.

Check yourself

1Which one fits?

朝あさ五ご時じに起おきて並ならんだのに、売うり切きれだった。早はや起おきした甲斐かいが(  )。

Choose an answer to see why.

2What does this mean?

手しゅ術じゅつの甲斐かいもなく、祖そ父ふは亡なくなった。

Choose an answer to see why.

3Which one fits?

娘むすめは(  )のある仕し事ごとを探さがしている。

Choose an answer to see why.

More detail

People make new がい words as they need them: 教おしえがい (rewarding to teach), 作つくりがい (rewarding to cook for).

More sentences