A whole nation of belligerent , snappish people ?

整个国家都是好战暴躁的人民？

In an ill-natured and snappish manner .

以脾气坏、急躁的方式。

My boss is snappish and critical .

我老板爱骂人又爱批评。

She said , slightly snappish , but not as bad as normal .

她说，稍有急躁，但并不像一般较差。

This could make you snappish . Try to remain calm .

这时要尽量使自己保持平静。