Gainfulness refers to the value or profitability of an activity or investment. Synonyms for gainfulness include profitability, productivity, success, effectiveness, and efficiency. Profitability refers to the ability of an investment or business to generate revenue that exceeds expenses. Productivity refers to the amount of output that a business or individual produces relative to the inputs used to create that output. Success refers to the accomplishment of a particular goal or objective. Effectiveness refers to the ability of a process or system to achieve its intended results. Efficiency refers to the ability to achieve a particular result with minimal waste or effort.