The correct reading is かくしつ, using the on'yomi for both kanji. 確 (かく) means certain or firm, and 執 (しつ) means to hold or persist. かくじつ misreads 執, often confused with 実. This word describes a deep-seated and often prolonged disagreement or conflict, typically between individuals or groups, characterized by firm differences and sometimes animosity.

正しい読みはかくしつで、両方とも音読みです。確（かく）は確かな・しっかりした、執（しつ）は執着する・こだわることを意味します。かくじつは執の読み間違いです。この言葉は、人や組織の間に生じる、根深い対立や意見の食い違いを指します。