
ängstlich
anxious / fearful
Feeling fear or worry; naturally inclined to become afraid quickly.
Mein Hund ist sehr ängstlich bei Gewitter.
My dog is very anxious during thunderstorms.
anxious / fearful
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anxious / fearful
Feeling fear or worry; naturally inclined to become afraid quickly.
Mein Hund ist sehr ängstlich bei Gewitter.
My dog is very anxious during thunderstorms.

overly anxious
Excessively careful or worried about doing or avoiding a particular thing.
Sie war ängstlich bemüht, bei der Präsentation keinen Fehler zu machen.
She was overly anxious to avoid making any mistakes during the presentation.
The adjective 'ängstlich' (anxious / fearful) is derived directly from the noun 'die Angst' (fear). The ending '-lich' here means 'full of' or 'characterized by'. So 'ängstlich' literally means 'full of fear'.
Seit dem Unfall ist sie ein sehr ängstlicher Mensch.
Since the accident, she has been a very anxious person.
When you want to name the reason for the fear, you use the preposition 'vor' followed by the dative. The structure is: 'ängstlich vor etwas sein' (to be afraid of something).
Viele Kinder sind ängstlich vor der Dunkelheit.
Many children are afraid of the dark.
In the meaning 'übertrieben sorgfältig' (overly careful), 'ängstlich' often appears in fixed combinations such as 'ängstlich bemüht sein' (to be anxiously trying) or 'ängstlich darauf bedacht sein' (to be anxious to make sure), followed by an infinitive construction with 'zu'.
Er war ängstlich darauf bedacht, einen guten Eindruck zu machen.
He was anxious to make a good impression.
careful / cautious
Vorsichtig describes the appropriate care and attention used to avoid mistakes or damage. Ängstlich can also express great care, but it suggests excessive worry. Vorsichtig fits reasonable caution, while ängstlich is more appropriate for behavior driven by strong concern.

Lea prüft das wichtige Formular ängstlich immer wieder, obwohl es längst vollständig ist.
Lea anxiously checks the important form over and over, even though it has long been complete.
Lea prüft das wichtige Formular vorsichtig, bevor sie es abschickt.
Lea carefully checks the important form before sending it.