Source : Webster's Revised Unabridged Dictionary (1913)

Poseur \Po`seur"\, n. masc.; pl. {Poseurs}, Poseuse \Po`seuse"\,
   n. fem.; pl. {Poseuses}, [F.]
   A person who poses or attitudizes, esp. mentally.

Source : WordNet®

poseur
     n : a person who habitually pretends to be something he is not
         [syn: {poser}]