理据 = motivation 平常心 = calmness 无所适从 = uncertainty

理據 is evidence. It also depends on the context. 平常心means an ordinary mind or a normal mind. If someone has 一颗平常心, he or she can face failure or success calmly. Just take things as they are. It emphasizes the attitude towards something has happened. A peaceful mind more means the peaceful situation in one' heart. 無所適從 means be at a loss as to what to do or you may say do not know what course to take. Hope to be helped somewhat to you