adjective Date: 1750 not efficient: as, not producing the effect intended or desired, wasteful of time or energy , incapable , incompetent , ~ noun ~ly adverb
INEFFICIENT
Meaning of INEFFICIENT in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012