1. (adj) inefficient
not producing desired results; wasteful
Synonyms: ineffective
Antonyms: high-octane, economic, competent, cost-efficient, efficient, streamlined, cost-effective, economical, businesslike, expeditious
2. (adj) ineffective, inefficient
lacking the ability or skill to perform effectively; inadequate
Synonyms: unable, ineffective, ineffectual, inefficient, uneffective
Antonyms: expeditious, cost-efficient, high-octane, streamlined, economic, businesslike, competent, efficient, cost-effective, economical
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Synonyms for inefficient 
