long-term
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long-term
Lasting, extending, or taking effect over a long period of time. The word is usually used as part of compounds, but it can also stand on its own.
Die Studie ist langzeit angelegt und soll erst in zehn Jahren abgeschlossen sein.
The study is designed to be long-term and is not expected to be completed for another ten years.
The word is a simple compound of 'lang' (long) and 'die Zeit' (time). So it literally describes something that relates to a long period of time.
Die Langzeitfolgen der Krankheit sind noch unbekannt.
The long-term consequences of the illness are still unknown.
'langzeit' (long-term) is most commonly used as the first part of a compound word, often with a hyphen. It indicates that the second part of the word has a long-term character.
Er befindet sich in einer Langzeit-Therapie.
He is in long-term therapy.
When 'langzeit' (long-term) stands on its own, it is almost only used predicatively, meaning after the noun and often in connection with verbs like 'anlegen' (to design or set up). It is not declined before a noun like a normal adjective.
Das Forschungsprojekt ist auf fünf Jahre langzeit angelegt.
The research project is designed to be long-term over five years.
permanent / lasting
Both words refer to a long period of time. „Langzeit“ mainly says that something lasts or has an effect for a long time, without ruling out an end; „dauerhaft“ more strongly emphasizes that it is meant or expected to remain. Use „langzeit“ for a long-lasting but limited effect and „dauerhaft“ for lasting permanence.
Die langzeit wirksame Behandlung wird über mehrere Jahre beobachtet.
The long-term treatment will be monitored over several years.
Die Behandlung soll dauerhaft gegen die Beschwerden helfen.
The treatment is intended to provide lasting relief from the symptoms.
