unbreedable en · ADJ
Etymology
From un- + breedable.
Meanings
-
(not-comparable) Unable to be bred.
However, some birds of this type are unbreedable individuals that are too old, incompatible with available mates, or infertile.
2009, Mattie Sue Athan, Dianalee Deter, Guide to the Senegal Parrot and Its Family, Barron's, →ISBN, page 117: