efficient Antonyms

inefficient nonlinear worthless weak wasteful valueless vain useless unwieldy unsystematic unprofessional unprofitable boondoggle ham-fisted butterfingered anticlimactic noncompliant unskilled junky unavailing unsuccessful unreal sisyphean shuffled scrambled rumpled rudderless rewardless resultless remiss sleeveless slipshod slipslop unfruitful uncapable unable thankless teemless successless sticker sterile random swayback about as useful as a chocolate teapot uneffective uneconomical uneconomic time-wasting time-consuming undisciplined