What is a better word for "efficiently"?

A better word for efficiently depends on context and what nuance you want to emphasize, but common alternatives include effectively, productively, quickly, smoothly, or economically. If you mean doing something quickly and well, you could say effectively, productively, or proficiently. If you mean without wasting time, you could say promptly, swiftly, quickly, or in a timely manner. If you mean without wasting money or energy, you could say economically, cost-effectively, or optimally. In business writing, alternatives include streamlined, in a streamlined manner, or with optimal resource use. For personal work habits, you could say methodically, systematically, or in an organized manner. For example instead of saying she works efficiently you could say she works effectively, productively, quickly and accurately, or in a well-organized manner. Instead of saying the system runs efficiently you could say it runs smoothly, optimally, or with minimal waste. The word efficiently is slightly formal, so in everyday speech people often say well, quickly, or in a smart way. Choosing a better word means selecting one that matches whether you want to emphasize speed, quality, economy, or organization, but effectively and productively are the most versatile replacements.