(adj) not producing desired results; wasteful, Ant. efficient, Example:an inefficient campaign against drugs; outdated and inefficient design and methods
a. 1. Not efficient; not producing the effect intended or desired, or achieiving the effect by unnnecessary and excessive expenditure of resources; inefficacious; as, inefficient means or measures; inefficient methods are too expensive. [ 1913 Webster +PJC ]
2. Incapable of, or indisposed to, effective action; habitually slack or remiss; effecting little or nothing; as, inefficient workmen; an inefficient administrator. [ 1913 Webster ]