Encara no tenim significats per a "become unfruitful".
1He very likely does not know that the seed is choked, and that he has become unfruitful.
2The understanding of the word is choked out and he becomes unfruitful.
3All these thorns enter in, choke the word, and it becomes unfruitful.
4The hen with the golden eggs becomes unfruitful as soon as she tries to find out why her eggs are golden.