1. superlative form of fruitful; most productive, beneficial, or successful in results
Usage: superlative degree; formal or literary register

Examples

• The fruitfullest years of her career were marked by groundbreaking discoveries.
• Their collaboration proved to be the fruitfullest partnership in the company's history.
• The fruitfullest approach to solving the problem combined both traditional and modern methods.
• His fruitfullest efforts resulted in a comprehensive solution that satisfied all stakeholders.
• The fruitfullest period of the research project yielded the most significant findings.