(a) Conducive to productivity; causing to bear in abundance: fruitful earth.
(a) Producing one thing by the bucket load; prolific: an effective writer of fiction.
Productive of, abounding in, or positive towards the development of fruit, or of good use plant life overall: since, a, fruitful country or earth; an effective season; fruitful baths.
Bearing offspring; respected; not barren.
Productive of outcomes; yielding, bringing, or favoring production or purchase whatsoever: since, an effective enterprise or trip; fruitful investigations or ideas; fruitful in expedients or in crimes.