This is the 14236th most frequent German word.
heiteres
"Cheerful" or "bright."
Here, 'heiteres' is used as an adjective describing the noun 'Blau', indicating a bright or cheerful shade.
Der Himmel ist heute ganz heiteres Blau.
The sky is very clear blue today.
In this sentence, 'heiteres' qualifies the noun 'Lachen', expressing a sense of joyfulness or cheerfulness.
Das heiteres Lachen der Kinder erfüllte den Garten.
The cheerful laughter of the children filled the garden.
The adjective 'heiteres' is used here to describe the noun 'Abend', referring to a pleasant and lighthearted time.