die Besorgnis
concern
A feeling of worry, fear, or unease in view of an uncertain or threatening situation.
Die anhaltende Trockenheit erfüllt die Landwirte mit großer Besorgnis.
The continuing drought fills the farmers with great concern.

concern
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concern
A feeling of worry, fear, or unease in view of an uncertain or threatening situation.
Die anhaltende Trockenheit erfüllt die Landwirte mit großer Besorgnis.
The continuing drought fills the farmers with great concern.

'Die Besorgnis' (concern) belongs to the word family of 'die Sorge' (worry) and the adjective 'besorgt' (worried / concerned). It describes the feeling or state of being worried and is often found in more formal contexts.
Seine Abwesenheit löste bei seiner Familie große Besorgnis aus.
His absence caused great concern among his family.
To express the reason for the worry, you use the preposition 'über' followed by the accusative. So one has Besorgnis 'über' (concern about) something.
Es herrscht Besorgnis über die wirtschaftliche Entwicklung des Landes.
There is concern about the country's economic development.
The noun is often used in fixed expressions with verbs. Typical phrases are 'Besorgnis äußern' (to express concern), 'Besorgnis auslösen' (to cause concern), or 'Anlass zur Besorgnis geben' (to give cause for concern).
Die Wissenschaftler äußerten ihre Besorgnis über den Klimawandel.
The scientists expressed their concern about climate change.
fear
'die Angst' and 'die Besorgnis' can both have to do with worry about something negative. 'Angst' is usually stronger and more personal; you feel threatened or are truly afraid. 'Besorgnis' sounds calmer and somewhat more formal. It is often used when talking about an uncertain situation or worrying about others. In everyday life, people say 'Angst' more often; in the news, letters, or more serious conversations, 'Besorgnis' often fits better.

Am Abend spricht der Chef mit Besorgnis über die hohen Kosten.
In the evening, the boss speaks with concern about the high costs.
Du musst keine Angst haben, wenn du heute zum Amt gehst.
You don't need to be afraid when you go to the government office today.