Wu Ying-chih, Wu Ta-you's foster daughter who lived with him for more than 30 years, says that although he was solitary, he was never lonely. He always had a childlike heart, and a generous sense of humor. Indifference to fame and fortune, a pair of shabby old shoes, and a 30-year-old suit were his trademarks.
而陪伴吳大猷三十餘年的義女吳吟之說，吳大猷雖然孤獨卻不寂寞，一直擁有一顆赤子之心，並且充滿幽默感；他一生淡泊名利，一雙快磨破的老鞋子，和一件近三十年的老西裝，就是他長年的行頭。