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Adjective unproductive has 2 senses
unproductive - not producing or capable of producing; "elimination of high-cost or unproductive industries"Antonyms:  productive, amentiferous, amentaceous, arable, cultivable, cultivatable, tillable, bearing, fecund, fertile, prolific, fruitful, profitable, oil-bearing, rich
 
unproductive - not producing desired results; "the talks between labor and management were unproductive"Antonyms:  effective, effectual, efficacious (indirect, via ineffective)
 
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