1. the quality or state of being fertile; the ability to produce offspring or crops abundantly
2. the quality of being rich in resources or ideas; creative or intellectual abundance

Examples

• The fertileness of the soil made it ideal for growing crops.
• The region's fertileness supported a thriving agricultural economy.
• Her fertileness of imagination produced countless creative works.
• The fertileness of the land attracted settlers from across the country.
• The fertileness of his mind led to many innovative discoveries.
• Ancient civilizations flourished in areas known for their fertileness.