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She is said to be very bitter about the way she was fired.

据说她对自己被解雇的方式仍很气愤。

《柯林斯英汉双解大词典》

This medicine tastes very bitter.

这药苦极了。

《新英汉大辞典》

The bitter, of course, are the ones that are very high in cyanide.

苦的根，当然，是富含氰化物的那种。

麻省理工公开课 - 化学原理课程节选

So, it seems, some people are very bitter indeed about the proposed sugar tax.

BBC: Charity calls for sugar tax in Irish Republic

Writer Harry Reid said the incident left the university campus "a very bitter and divided place".

BBC: Day Queen booed at Stirling university remembered

The result of this, he says, is that they can become "very bitter and twisted when they don't make it".

BBC: Can you still go from burger flipper to president?