悪あく性しょう

noun, na-adjective

evil nature; licentiousness; lewdness

Refers to a person's inherently wicked or morally corrupt character, often with a connotation of sexual depravity. Somewhat literary or formal.

• 彼かれの悪あく性しょうは幼おさない頃ころから周しゅう囲いを困こまらせていた。