beneficent - Dictionary definition and meaning for word beneficent
Simply think about beneficial(something gives benefit) which help people.
ben+eficent--eficent sounds like efficient--> efficient people are the ones who does good or produces good.
sounds like BEEN EFFICIENT: so he/she(s) been doing good..
Ben means always good.. So, whatever word starts from Ben means good.. Mal is bad like Malevolent..