shrewd: stresses the possession or effect of practical, hardheaded cleverness and wise, although sometimes selfish judgment: a ~ judge of character.    (这里judge作动词)


sagacious: suggests wisdom, penetration, farsightedness, and mature keenness of judgment: a series of ~ investments tripled her wealth.


perspicacious: implies unusual power to see into and understand what is puzzling and hidden: the ~ counselor saw through his facade. (façade: 建筑正面，外表假象)


astute: suggests shrewdness, perspicacity, and artfulness, and often an incapacity for being fooled: an ~ player of party politics.


shrewd精明: 务实冷静(hardheaded务实不感情用事)的聪明, 明智(有时自私)的判断力，sagacious: 表示有智慧洞察力远见，perspicacious洞察: 观察理解隐藏难懂事物的能力，astute: 精明洞察力世故，常表示无法被愚弄


记忆方法: 1）首字母SSPA事事平安<==睿智的人化危为安


         2）睿智的意思是敏锐观察，明智判断mean acute in perception, sound in judgment.