furious
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to be furious with
A colloquial expression for being very angry or annoyed with someone.
Ich bin immer noch total pest auf ihn, weil er unser Treffen einfach vergessen hat.
I'm still totally furious with him because he simply forgot our meeting.
This adjective is used almost exclusively in the fixed construction 'pest sein auf jemanden' (to be furious with someone). The person you are angry with is always used with the preposition 'auf' and the accusative.
Sie ist pest auf ihre Freundin, weil sie nicht zurückgerufen hat.
She is furious with her friend because she didn't call back.
The expression is derived from the noun 'die Pest' (the plague, a serious disease). The imagery makes the intense anger clear—you are so annoyed that you could wish the plague on the person.
Nach dem Streit war er tagelang pest auf seinen Kollegen.
After the argument, he was furious with his colleague for days.
'Pest sein' (to be furious) is a very informal colloquial expression. You should only use it when talking with friends or in informal situations, not in formal emails or official conversations.
Sei nicht gleich pest, es war doch nur ein Witz!
Don't get furious right away, it was only a joke!
angry / evil / bad
'böse' and 'die Pest sein auf' can both express that someone is angry or annoyed. 'böse' is more neutral and fits many situations: you can be 'böse auf jemanden' (angry with someone) or 'böse über etwas' (angry about something). 'Die Pest sein auf' is colloquial and stronger. It sounds very emotional and is more suitable in conversations with friends or family. Learners may confuse the words because both show anger. The important point is: 'böse' is more general, while 'pest sein auf' says more strongly that someone is really furious.
Nach dem Streit war Tom die Pest auf seinen Kollegen.
After the argument, Tom was furious with his colleague.
Meine Schwester ist böse auf mich, weil ich ihren Geburtstag vergessen habe.
My sister is angry with me because I forgot her birthday.