A simple word for efficiency depends on context, but common simple synonyms include effectiveness, productivity, economy, or ability to get more from less. For everyday use, the simplest way to explain efficiency is doing more with less or not wasting. Other simple words that capture parts of efficiency include skill, meaning you do something well with little effort, thrift meaning you use resources wisely, speed meaning you do it quickly without waste, or organization meaning you have a smart system. In physics or engineering, a simple word for efficiency is performance, as in how well a machine converts input to useful output. In business, productivity is often used as a simple substitute, meaning output per input. For personal life, words like smart, clever, or streamlined convey efficiency in an easy to understand way. The concept behind all these is the same, achieving the desired result while minimizing wasted time, effort, money, or energy. So if you need one simple everyday word, productivity or effectiveness is probably closest, but the phrase not wasteful is the most universally understood simple description of efficiency.
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