1 fruitful, fertile, rich, fecund, plentiful, plenteous, abundant, bountiful, bounteous, prolific, dynamic:
Owing to a perfect balance of rain and sunshine, the earth has proved productive this year
2 imaginative, creative, inventive, resourceful, generative, ingenious, fertile, vigorous:
Her latest science-fiction trilogy is certainly evidence of a highly productive mind
3 profitable, remunerative, rewarding, valuable, worthwhile:
Years ago he made an investment in computer shares that has turned out to be very productive. Discussing sales strategy is not as productive as getting out there and selling.