unberechenbar
unpredictable, erratic
adjective un-be-REKH-en-bar Rare
Also means
mercurial, unreliable
Usage Note
Unberechenbar literally means 'incalculable' and, applied to people, describes an unreliable temperament from which you cannot predict what comes next. It can be neutral-scientific (unpredictable weather) or clearly negative about a person's volatile behaviour.
Examples
"Der unberechenbare Chef schuf ein angespanntes Arbeitsklima."
Natural Translation
The unpredictable boss created a tense working environment.
Literal Translation
The unpredictable boss created a tense work climate.
Related Words
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