inefficient
/ˌɪn.ɪˈfɪʃ.ənt/ adjective B2- Not efficient; not producing the effect intended or desired; inefficacious. · Celery is an inefficient food.
- Incapable of, or indisposed to, effective action; habitually slack or unproductive; effecting little or nothing. · inefficient workers· an inefficient administrator
From the library
There I was stretched, when you, my dear Watson, and all your following were investigating in the most sympathetic and inefficient manner the circumstances of my death.
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