Psychological research is replete with labels such as "borderline personality," or "pathological Liar, or "sociopath." I suppose one could characterize Wickham as someone self-deluded and unable to self-examine with any degree of truthful accuracy. Yes, and we have one of these types in our family too, so I speak with an element of veracity about this. In Miss Austen's world he's just a "bad dude."