WordWeb Online

1. Not producing or capable of producing
   "elimination of high-cost or unproductive industries"
    
2. Not producing desired results
   "the talks between labour and management were unproductive"

See also: bootless, dry, fruitless, futile, ineffective, ineffectual, infertile, nonproductive, sleeveless, sterile, uncreative, uneffective, unfertile, unproductively, unproductiveness, unprofitable, vain

Antonym: productive