笃（篤）dǔ ❶ (忠实；一心一意) sincere;earnest:～ 行 sincere conduct；～ 志 tenacious of purpose
❷ （病势沉重） (of an illness) serious;critical:病 ～ be dangerously ill;be in a critical condition;be terminally ill
◆笃厚 sincere and magnanimous；
笃老之年 a very old age;a venerable age；
笃实 （忠诚老实） honest and sincere;uprightness;sincerity;（实在） solid;sound；
笃信 sincerely believe in;be a devout believer in;earnest belief;believe truly；
笃学 diligent in study;devoted to study;studious |