nonproductive (adj.)

• acarpous
• arid
• barren
• celibate
• childless
• desolate
• drained
• dried-up
• dry
• exhausted
• fallow
• fruitless
• gaunt
• gelded
• impotent
• ineffectual
• infertile
• jejune
• leached
• menopausal
• sterile
• uncultivated
• unfertile
• unfruitful
• unplowed
• unproductive
• unsown
• untilled
• virgin
• waste
• wasted