Not producing or able to produce large amounts of goods, crops, or other commodities. The unproductive land yielded very little harvest this year.
Not achieving significant or desired results. The meeting was unproductive, as no decisions were made.
Not producing or contributing to the growth or development of something. His unproductive habits were hindering his progress at work.
(Linguistics) Not capable of forming new words or grammatical forms in current usage. The suffix “-en” as in “worsen” is largely unproductive in modern English.