Superficial charm

Glib and superficial charm  is "the tendency to be smooth, engaging, charming, slick, and verbally facile." The phrase often appears in lists of attributes of psychopathic personalities. According to Hare, "Psychopathic charm is not in the least shy, self-conscious, or afraid to say anything." The term also occurs in Hotchkiss' discussion of narcissism : "Their superficial charm can be enchanting."