As a Noun: 1. A feeling of extreme anger and inability to control your behaviour. English = temper, fury, rage. 2. The tendency someone has to become angry or to stay calm. English = temper. As a Verb or Adjective: 1. Of a person, to be extremely angry. English = (be) furious. Informal English = (be) pissed off. 2. Of a person, to suddenly become extremely angry and unable to control your behaviour. Idiomatic English = go off one's rocker, hit the roof.