metallic
Having the property or appearance of metal; shining or shimmering like metal.
Das Auto hat eine moderne Lackierung in einem Metallic-Grau.
The car has a modern paint finish in metallic gray.

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Having the property or appearance of metal; shining or shimmering like metal.
Das Auto hat eine moderne Lackierung in einem Metallic-Grau.
The car has a modern paint finish in metallic gray.

The adjective 'metallic' derives directly from the noun 'das Metall' (metal). It describes properties that are typical of metal, such as shine or a particular sound.
Der Roboter hatte eine glänzende, metallische Oberfläche.
The robot had a shiny, metallic surface.
You can tell from context whether 'metallic' describes an appearance or a sound. Words like 'Farbe' (color), 'Lack' (paint), or 'Glanz' (shine) point to the visual meaning, while 'Klang' (sound), 'Stimme' (voice), or 'Geräusch' (noise) point to the acoustic meaning.
Die metallic-grüne Farbe des Fahrrads schimmert in der Sonne.
The metallic green color of the bicycle shimmers in the sun.
In the visual meaning, 'metallic' is very often used as part of a color term, especially for car paint. It often comes directly before the actual color and is connected with a hyphen.
Er hat sich ein neues Auto in Metallic-Schwarz gekauft.
He bought himself a new car in metallic black.
weak / matte
'matt' and 'metallic' are opposites when describing the appearance of surfaces. 'matt' means that a surface does not shine and does not reflect. 'metallic' describes a metallic shine or shimmer, like metal. So when talking about paint, color, or material, 'matt' tends to look calm and dull, while 'metallic' tends to look shiny and eye-catching.

Das neue Fahrrad meiner Nachbarin hat eine blaue Metallic-Farbe.
My neighbor’s new bicycle has a blue metallic finish.
Frau Hoffmann wählt für die Küche einen matten Lack ohne Glanz.
Mrs. Hoffmann chooses a matte paint finish without shine for the kitchen.