[{"Bold_text": "adjective", "List Items": ["performing or functioning in the best possible manner with the least waste of time and effort; having and using requisite knowledge, skill, and industry; competent ; capable :a reliable, efficient assistant.Synonyms: effectual", "satisfactory and economical to use:Our new air conditioner is more efficient than our old one.", "producing an effect, as a cause; causative .", "utilizing a particular commodity or product with the least waste of resources or effort (usually used in combination):a fuel-efficient engine."]}]