the GNU version of the Collaborative International Dictionary of English
adj. Incapable of being engendered or produced; original.
The Century Dictionary and Cyclopedia
That may be ingenerated or produced within.
Not generable; incapable of being engendered or produced.
Word Usage
"That such abstract ideas, with names to them, as we have been speaking of are essences, may further appear by what we are told concerning essences, viz. that they are all ingenerable and incorruptible."