In-effectiveness is a term used to describe the inability to achieve desired results or goals. Some antonyms for in-effectiveness are effectiveness, efficiency, productivity, proficiency, skillfulness, capability, and competency. When an individual or organization is effective, it means they are able to achieve their objectives and get the desired results. Efficiency, on the other hand, means performing tasks with the least amount of waste, energy, or time. Productivity refers to the ability to produce results that are valuable or useful. Proficiency entails having a high level of knowledge and skill in a particular area. Capability relates to the competence or capacity to perform tasks, while competency is the ability to perform tasks effectively and efficiently.