Perhaps just "genderless," then? Neutrois is fairly close... but I've often seen it being used to describe gender-neutral or gender-irrelevant (is that the right term?) people rather than people who are outside of gender spectrums entirely.
Are any of you familiar with the site
genderqueer.tumblr.com? The interpretations of the term there are incredibly varied, I think it's interesting to see how differently some people define it.
Personally... I think I confused people when I said I identify mostly as male, yet still consider myself genderqueer. For me, there's a difference between my body identity and my mental identity. I'm uncomfortable having a female body, much more comfortable now that I'm on testosterone. Because female pronouns make me aware of my physical self, I don't like people to use them in reference to me. However, mentally I don't think I'm much more male than female. I'm somewhat genderfluid, I definitely have the occasional day when I'll wake up and just
feel female... I don't mind looking and acting stereotypically male, but I'm also comfortable looking and acting stereotypically female, I even desire it. I don't much care at this point how people perceive me, I enjoy seeming ambiguous, as long as I'm binding I'm comfortable.
That fluidity delayed my transition, because I wanted to make sure on my female-leaning days I would still be comfortable with a male body and social interactions. My precise mental gender is still somewhat uncertain to me, but I'm okay with that. Bit of a faux pas, I suppose, linking my declared gender to my physical identity rather than mental, but it's a pain in the ass to explain otherwise. "Genderqueer guy" is so much easier.