Great Effort, Exertion, Grueling Effort
noun, verbal noun
You toil and use your strength. Ugh! How difficult. You really put in a great effort.
どりょく
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
あんた、努力しないで社長になれるとでも思ってんの？
Hey, are you really thinking you can become a company president without making any efforts?
宝くじを当てるのだって、それなりの努力が必要なんだよ！
Even winning the lottery requires a certain amount of effort, alright?
努力しても、結果が出なくては意味が無い。
Even if you work hard, if you don't have results, there isn't a point to it.