predictable / calculable
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predictable
Refers to a person or situation whose behavior or development is easy to predict. This can be neutral or also negative in the sense of 'monotonous' or 'without surprises.'
Seine Reaktionen sind absolut berechenbar; er regt sich immer über die gleichen Dinge auf.
His reactions are absolutely predictable; he always gets upset about the same things.
'Berechenbar' (predictable/calculable) is derived from the verb 'berechnen' (to calculate) and the ending '-bar' (-able). The ending '-bar' means that something can be done. Literally, it means 'can be calculated.'
Die Kosten für das Projekt sind nur schwer berechenbar.
The costs for the project are difficult to calculate.
The direct opposite is formed with the prefix 'un-': 'unberechenbar' (unpredictable). This is a very common word and means that something or someone cannot be predicted.
Das Wetter in den Bergen ist oft unberechenbar.
The weather in the mountains is often unpredictable.
If the word refers to people, their behavior, or their reactions, the meaning is 'vorhersehbar' (predictable) (m01). If it is about numbers, costs, risks, or physical data, the mathematical meaning 'kalkulierbar' (calculable) (m02) is meant.
Sein Tagesablauf ist so berechenbar, dass man die Uhr nach ihm stellen kann.
His daily routine is so predictable that you could set your watch by him.
When a person is described as 'berechenbar' (predictable), it is often meant negatively. It implies that the person is boring, uncreative, or easy to see through.
Ich finde den neuen Kollegen etwas langweilig, er ist mir zu berechenbar.
I find the new colleague a bit boring; he is too predictable for me.
constant
'konstant' and 'berechenbar' can both describe that something does not change in surprising ways. 'konstant' means that something stays the same over a longer period of time, for example a temperature, quality, or performance. 'berechenbar' means that you can roughly predict what will happen or how someone will behave. So something can be predictable because it is constant. But the focus is different: 'konstant' describes the state itself, while 'berechenbar' describes the fact that you can plan around it well.
Bei gutem Wetter ist die Fahrtzeit auf dieser Strecke ziemlich berechenbar.
In good weather, the travel time on this route is quite predictable.
Die Temperatur im Raum bleibt den ganzen Tag konstant.
The temperature in the room remains constant all day.