What are the opposite words for inefficiency?

Efficiency is the ability to accomplish a task with minimal waste of time, energy, or resources. Antonyms, or opposite words, for the word inefficiency include words like productivity, proficiency, effectiveness, competence, and proficiency. These words describe a state of being capable and successful in achieving one's goals. In contrast to inefficiency, productivity implies the ability to produce goods or services efficiently, while proficiency describes the ability to perform a task with expertise and competency. The opposite of inefficiency is the state of being effective, where you can achieve your objectives efficiently and with minimal waste. Competence, on the other hand, implies the presence of sufficient knowledge, skills, and resources to carry out a task effectively.