un ‧ pro ‧ duct ‧ ive /ˌʌnprəˈdʌktɪv◂/ BrE AmE adjective
[ Word Family: noun : ↑ produce , ↑ producer , ↑ product , ↑ production , ↑ reproduction , ↑ productivity ; adjective : ↑ productive ≠ ↑ unproductive , ↑ counterproductive , ↑ reproductive , ↑ reproducible ; verb : ↑ produce , ↑ reproduce ; adverb : ↑ productively ]
not achieving very much:
an unproductive meeting