UNPRODUCTIVE
unproductive
(adjective) not producing desired results; “the talks between labor and management were unproductive”
unproductive
(adjective) not producing or capable of producing; “elimination of high-cost or unproductive industries”
Source: WordNet® 3.1
Etymology
Adjective
unproductive (comparative more unproductive, superlative most unproductive)
Not productive; useless; fruitless.
(linguistics, of affixes, mechanisms of word formation, etc) No longer used to produce new words (see examples).
Synonyms
• nonproductive
• unyieldly
Source: Wiktionary