Answer:

prolific

Answer	Crossword Clue
PROLIFIC	Fertile
PROLIFIC	Very productive
PROLIFIC	Producing freely

PROLIFIC	Very productive, as a writer
PROLIFIC	Fecund
PROLIFIC	Like Isaac Asimov
PROLIFIC	Putting out a lot
PROLIFIC	Bearing in abundance
PROLIFIC	Abundantly fruitful

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.