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Guest
I think as far as ENTJs go, that they tend to be quite reserved in their personalities. Rather, they do not seem like typical extroverts who party-hardy and all over the place. Most of the ENTJs I have encountered tend to strike people as opinionated, intimidating, and confident/aggressive. However, all the ENTJs I know also happen to have a dark side, in which they chronically suffer from loneliness.
I would say that ENTJs' greatest fear is being seen as incompetent or financially unsuccessful. As far as being alone with nothing to do, I think a pervasive boredom would indicate an ENTJ who is attempting to fill in the blanks with distractions---distractions really make people feel less in touch with their destiny, and more in tuned with their neuroses, which could be a bad thing for the ENTJ.
Now this hits it for me.
I think one of my biggest fears has typically involved doing things that I couldn't master immediately, thus probably a fear of being seen as incompetent. Another is when I don't have something concrete to look forward to and I struggle with finding something--that typically happens as I move from conquest to conquest, always wondering and worried over what the "next big thing" is for me to tackle. It's kind of like I never feel complete and contented for very long until I move onto something else, and sometimes it makes me fearful of what's going to happen in the future.
Vulnerability's probably in there, too. I hate it when I let my guard down and the other person hasn't, and they end up using my vulnerability against me.