In my opinion, there's no jealousy in the 9 of Pentacles. Only acceptance, harmony, and success... if we're judging it as an actual 'trait' of a person. It would be someone who had achieved what they wanted, though perhaps at the expense of their social relationships; but they wouldn't be upset about that or have cause to be jealous, based on this card. (Other cards could indicate a dissonance.)
For the negative (and there aren't many in this card) They might be a bit aloof and appear anti-social, but they really aren't. They may be a bit 'different' but in a good way. Mildly eccentric.