bläulich
bluish
Having a slight coloring tending toward blue or a blue shimmer.
Im Dämmerlicht hatte der Schnee einen bläulichen Schimmer.
In the twilight, the snow had a bluish shimmer.

bluish
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bluish
Having a slight coloring tending toward blue or a blue shimmer.
Im Dämmerlicht hatte der Schnee einen bläulichen Schimmer.
In the twilight, the snow had a bluish shimmer.

The ending '-lich' is added to the adjective 'blau' (blue). It weakens the quality and means 'a little blue' or 'having a blue shimmer.'
Das Wasser des Bergsees hatte eine grünlich-bläuliche Farbe.
The water of the mountain lake had a greenish-bluish color.
'Bläulich' (bluish) is often used to describe a subtle coloring or a light effect. Common combinations are 'bläulicher Schimmer' (bluish shimmer), 'bläuliche Färbung' (bluish coloring), or 'bläuliche Flecken' (bluish spots/bruises).
Nach dem Sturz hatte er einen großen bläulichen Fleck am Bein.
After the fall, he had a large bluish bruise on his leg.
Like most adjectives, 'bläulich' (bluish) can stand directly before a noun or be used with verbs like 'sein' (to be), 'wirken' (to seem), or 'aussehen' (to look) to describe a subject.
Sie trug ein Kleid mit einem bläulichen Muster.
She wore a dress with a bluish pattern.
blue
'blau' and 'bläulich' both describe a color in the blue range. 'blau' means the clear color itself, for example with a shirt, car, or sky. 'bläulich' means that something only looks slightly blue or has a blue shimmer. Learners may confuse the words because they look similar and refer to the same color range. As a simple guide: if the color is clearly blue, you say 'blau'. If it only tends a little toward blue, you say 'bläulich'.

Das Licht im Flur wirkt heute bläulich und kalt.
The light in the hallway looks bluish and cold today.
Für das Vorstellungsgespräch trägt Mehmet ein blaues Hemd.
Mehmet is wearing a blue shirt for the job interview.