不學無術

From The Book of Han, Vol. 68 (《霍光傳》贊, Eulogy to the Memoir of Huo Guang):

然光不學亡術，闇於大理，陰妻邪謀，立女爲后，湛溺盈溢之欲，以增顛覆之禍，死財三年，宗族誅夷，哀哉！ [Classical Chinese, trad.]

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然光不学亡术，暗于大理，阴妻邪谋，立女为后，湛溺盈溢之欲，以增颠覆之祸，死财三年，宗族诛夷，哀哉！ [Classical Chinese, simp.]

From: The Book of Han, circa 1^st century CE

Rán guāng bù xué wú shù, àn yú dàlǐ, yīn qī xié móu, lì nǚ wéi hòu, chénnì yíngyì zhī yù, yǐ zēng diānfù zhī huò, sǐ cái sānnián, zōngzú zhūyí, āizāi! [Pinyin]

But Huo Guang lacked learning and over-all strategy and was blind to fundamental principles. He shielded his wife’s nefarious designs, had his daughter made empress, and drowned himself in an ever-swelling sea of desires, thus hastening the day when disaster would strike. Barely three years after his death his family was exterminated, a sad fate indeed!

不學無術

1. to be tactless due to the lack of knowledge; without learning or skills; to be not keen on learning anything