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|Adj.||1.||unfertile - incapable of reproducing; "an infertile couple"|
unfruitful - not fruitful; not conducive to abundant production
impotent - lacking power or ability; "Technology without morality is barbarous; morality without technology is impotent"- Freeman J.Dyson; "felt impotent rage"
unproductive - not producing or capable of producing; "elimination of high-cost or unproductive industries"