Usage Note
Martien functions as both noun (un Martien, a Martian) and adjective (un paysage martien, a Martian landscape). The feminine is martienne. In colloquial French, parler comme un Martien means to speak in a way nobody understands, or to be out of touch with ordinary life.
Examples
"Ce paysage ressemble à un décor martien."
Natural Translation
This landscape looks like a Martian setting.

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