One who is not sexually, physically, or mentally attracted to either sex (male or female), or
anything else for that matter (animals, themselves, people in general, etc.).
One who avoids (whether
naturally or on purpose) love, dating, sex, crushes, intimacy,
relationships, or anything of the likes.
John does not find women
attractive and never wants to be in a
relationship with one, however, because he feels
the same way about men, he is a-sexual.