Antonyms of adj tillable

1 sense of tillable

Sense 1
arable, cultivable, cultivatable, tillable -- ((of farmland) capable of being farmed productively)

INDIRECT (VIA productive) -> unproductive -- (not producing or capable of producing; "elimination of high-cost or unproductive industries")

Similarity of adj tillable

1 sense of tillable

Sense 1
arable, cultivable, cultivatable, tillable -- ((of farmland) capable of being farmed productively)
       => productive (vs. unproductive) -- (producing or capable of producing (especially abundantly); "productive farmland"; "his productive years"; "a productive collaboration")