At least they left us some water.最起码他们有水让我们喝。

at least：至少

We should brush our teeth at least twice a day.

我们每天应该至少刷两次牙。

A good cigarette will smoke at least ten minutes.

一支好烟至少可以抽10分钟。

Definitely not water.绝对不是水。

definite:adj.明确的, 一定的, 有把握的

I can't say anything definite yet.

我还不能肯定地说什么。

It's definite that he'll be late again.

他肯定又要迟到。

apparent, obvious, clear, definite这些形容词均含“清楚的，明白的，明显的”之意。

apparent强调显而易见或一想便知。这个词从动词appear派生而来，故有时含有表面如此而事实上未必的意味。

obvious语气较强，指极为明显，有目共睹，无需说明和论证。

clear普通用词，侧重清楚明白。

definite语气肯定，着重明白无误，无可怀疑。