illegitimate
Not conforming to known principles, or established or accepted rules or standards.
Not sanctioned by marriage.
Born to unmarried parents.
(dated) Having a child or children with a person to whom one is not married.
Not authorized by good usage; not genuine.
(botany) Involving the fertilization of pistils by stamens not of their own length, in heterogonously dimorphic and trimorphic flowers.
A person born to unmarried parents.
To make illegitimate.