infertile

(ĭn-fûrˈtl)

1. Not fertile; unproductive or barren.
2. Biology
   a. Not capable of initiating, sustaining, or supporting reproduction.
   b. Not fertilized and hence incapable of growing and developing: infertile duck eggs.
3. Not capable of sustaining crops or vegetation: infertile land.
4. Unproductive or producing little: a path of research that proved infertile.