Can Enneagram type 7s be introverted?

[Olimpia]

I don't think 7s can be introverted, but they certainly can have withdrawn periods. The reason for the extroversion of 7s isn't about being bubbly or anything, it's that they are very externally-focused, not very introspective. Very much looking at the external world for stimulation etc.

The 7's I've known have been extremely extroverted EXXp's who love engaging with people. It's kind of hard to visualize an introverted 7

I agree there; all the 7s I have known were Exxp, so I am inclined to believe 7s can only be Exxp.

That doesn't mean that all 7s will be extreme extroverts in the stereotypical sense. 7s can be SO blindspot and hence less sociable; add to that an introverted subtype and a 4 fix, and the person can definitely seem more withdrawn and ambiverted.