No, that couldn't be it. That makes no sense in context. Neither does "Illiterate," since he said I was educated. Hmm. "Illegitimate?" No, I was born in wedlock. "Illiberal," "illusive" or "illusory"? Perhaps. "Ill-mannered?" Yes, I am, but was that what he meant?

Just to wander back on-topic for a brief moment:

I cropped and shrank my avatar (drawn by Elia, by the way) to keep as much detail as possible in the tiny space available. I didn't want to just shrink the picture down.

Because then the illustration would be illegible.