See productive in Webster's New World Roget's A-Z Thesaurus II
adjective
Producing or able to produce a desired effect:
effective, effectual, efficacious, efficient. See thriveCapable of reproducing:
fecund, fertile, fruitful, prolific. (Biology) proliferous. See richCharacterized by great productivity:
fecund, fertile, fruitful, prolific, rich. See richActing effectively with minimal waste:
efficient. See industrious, thrive
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