abendlich
evening
Something that takes place in the evening, belongs to the evening, or is typical of the evening.
Wir genießen die abendliche Stille auf dem Balkon.
We enjoy the evening stillness on the balcony.

evening
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evening
Something that takes place in the evening, belongs to the evening, or is typical of the evening.
Wir genießen die abendliche Stille auf dem Balkon.
We enjoy the evening stillness on the balcony.

The adjective 'abendlich' (evening) is derived directly from the noun 'der Abend' (the evening). The ending '-lich' is often used to form adjectives from nouns that describe belonging or a characteristic.
Die abendliche Kühle zog langsam auf.
The evening coolness slowly set in.
'Abendlich' (evening) is often used to describe a particular atmosphere or regular events in the evening. Typical combinations are 'abendliche Ruhe' (evening quiet), 'abendliches Licht' (evening light), 'ein abendlicher Spaziergang' (an evening walk), or 'das abendliche Fernsehprogramm' (the evening TV program).
Wir machten einen abendlichen Spaziergang am See.
We took an evening walk by the lake.
This adjective belongs more to written or poetic language. It is used to create a special mood.
Der Roman beschreibt die abendliche Idylle eines kleinen Dorfes.
The novel describes the evening idyll of a small village.
in the evenings
'abends' and 'abendlich' both have to do with the evening, but they are used differently in grammar. 'abends' is an adverb and says when something happens: you work, read, or meet up 'abends' (in the evenings). 'abendlich' is an adjective and describes a noun: 'ein abendlicher Spaziergang' (an evening walk), 'die abendliche Ruhe' (the evening calm). Learners may confuse them because the meaning is similar. The simple rule is: for the time of an action, use 'abends'; before a noun, 'abendlich' fits.

Beim abendlichen Spaziergang war die Straße fast leer.
During the evening walk, the street was almost empty.
Ben trifft seinen Freund abends nach der Arbeit.
Ben meets his friend in the evenings after work.