
unnatürlich
unnatural
Not corresponding to nature; artificial, affected, or in a way that is perceived as strange or not normal.
Die Farbe ihrer Haare wirkte völlig unnatürlich.
The color of her hair looked completely unnatural.
unnatural
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unnatural
Not corresponding to nature; artificial, affected, or in a way that is perceived as strange or not normal.
Die Farbe ihrer Haare wirkte völlig unnatürlich.
The color of her hair looked completely unnatural.

unnatural
Behaving in an affected, inauthentic way.
Sein Lächeln wirkte gezwungen und unnatürlich.
His smile seemed forced and unnatural.
The word consists of the prefix 'un-', which expresses the opposite, and the adjective 'natürlich' (natural). Something that is 'unnatürlich' (unnatural) is therefore 'not natural'.
Die unnatürliche Stille im Wald machte ihm Angst.
The unnatural silence in the forest frightened him.
You can often recognize the meaning from context: If 'unnatürlich' (unnatural) refers to things, colors, materials, or movements, it usually means 'artificial'. If it refers to human behavior such as smiling or speaking, it means more like 'affected' or 'inauthentic'.
Der Joghurt hatte einen unnatürlich süßen Geschmack.
The yogurt had an unnaturally sweet taste.
When referring to affected behavior, 'unnatürlich' (unnatural) is often combined with verbs of expression. Typical examples are 'unnatürlich lächeln' (to smile unnaturally), 'unnatürlich klingen' (to sound unnatural), or 'sich unnatürlich verhalten' (to behave unnaturally).
Als er lügen musste, klang seine Stimme plötzlich unnatürlich hoch.
When he had to lie, his voice suddenly sounded unnaturally high.
artificial
Künstlich and unnatürlich can both describe an impression that is not spontaneous or genuine. Künstlich usually emphasizes that something seems deliberately put on or imitated; unnatürlich can also simply seem unusual or strained. Use künstlich when something clearly seems affected, and unnatürlich for an impression that merely seems strange.

Nach der Behandlung wirkte sein Lächeln etwas unnatürlich.
After the treatment, his smile seemed somewhat unnatural.
Für das Foto setzte sie ein künstliches Lächeln auf.
For the photo, she put on an artificial smile.