不可勝數

First attested in Hanfeizi:

且夫内以黨與劫弑其君，外以諸侯之權矯易其國，隱正道，持私曲，上禁君，下撓治者，不可勝數也。 [Traditional Chinese poetry, trad.]

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且夫内以党与劫弑其君，外以诸侯之权矫易其国，隐正道，持私曲，上禁君，下挠治者，不可胜数也。 [Traditional Chinese poetry, simp.]

From: Han Feizi, circa 2^nd century BCE

Qiěfú nèi yǐ dǎngyǔ jiéshì qí jūn, wài yǐ zhūhóu zhī quán jiǎoyì qí guó, yǐn zhèngdào, chí sīqū, shàng jìn jūn, xià náo zhì zhě, bùkě shèng shù yě. [Pinyin]

Again, those who intimidate and murder the rulers with partisans and adherents at home and reform or alter their states through the influences of the feudal lords outside, thus concealing the right way and upholding private crookedness so as to restrain the ruler above and obstruct the government below, are innumerable.

不可勝數

1. too numerous to count

   • 漢室中微，王莽篡位，士之蘊藉義憤甚矣。是時裂冠毀冕，相攜持而去之者，蓋不可勝數。 [Literary Chinese, trad.]
     汉室中微，王莽篡位，士之蕴藉义愤甚矣。是时裂冠毁冕，相携持而去之者，盖不可胜数。 [Literary Chinese, simp.]

     From: The Book of the Later Han, circa 5^th century CE

     Hànshì zhōngwēi, Wáng Mǎng cuànwèi, shì zhī yùnjiè yìfèn shèn yǐ. Shìshí liè huān huǐ miǎn, xiāng xiéchí ér qù zhī zhě, gài bùkěshèngshù. [Pinyin]

     When the Han declined in significance and Wang Mang usurped the throne, even courteous gentlemen of refined temperament were swollen with righteous indignation. At that time those who tore off their official hats, destroyed their ceremonial caps, joined hands and departed from service were too numerous to be counted.

• 不可勝計／不可胜计 (bùkěshèngjì)
• 數不勝數／数不胜数 (shǔbùshèngshǔ)