adequate

adj.足够的;合格的;合乎需要的;胜任的

例句：

This is an adequate amount so long as it is aimed in the right direction.

这是一个足够的数额，只要它的目标是正确的。

There are a lot of tasks to be done, there are inadequate rewards for most of them.

有很多任务要做，但大多数任务的回报都不足。