Fecklessnesses refers to the state of being ineffective or incompetent to accomplish tasks. Antonyms for this word include efficiency, capability, competence, effectiveness, and prowess. Those who demonstrate efficiency are focused, organized and able to complete tasks with minimal waste of time or resources. Capability refers to having the necessary skills, experience, and expertise to perform tasks. Competence entails having the appropriate qualifications, experience, and knowledge to complete tasks with excellence. Effectiveness refers to the level of success achieved in completing tasks. Prowess refers to exceptional abilities and skills demonstrated in accomplishing tasks. Overall, these antonyms all suggest a sense of capability, skill, and success in accomplishing tasks.