shaped or conditioned or disciplined by training; often used as a combining form; "a trained mind"; "trained pigeons"; "well-trained servants"
having acquired necessary skills by e.g. undergoing a course of study; "a trained nurse"; "a trained voice"; "trained manpower"; "psychologically trained workers"
highly educated; having extensive information or understanding; "an enlightened public"; "knowing instructors"; "a knowledgeable critic"; "a knowledgeable audience"