fertileEnglishOxford English Thesaurusfertile adjective 1 the soil is moist and fertile: fecund, fruitful, productive, high-yielding, prolific, proliferating, propagative, generative; rich, lush; rare fructuous. ▷antonyms infertile. 2 even couples who are fertile may adopt a child: able to conceive, able to have children, fecund, potent, generative, reproductive. ▷antonyms barren. 3 he has a particularly fertile brain: imaginative, inventive, innovative, innovational, creative, visionary, original, ingenious, resourceful, constructive; productive, prolific. ▷antonyms unimaginative.fertile Oxford Dictionary of English