The word '成瘾性' is formed by combining the character 成, meaning 'to become,' with 瘾, meaning 'addiction,' to create the compound 成瘾, meaning 'to become addicted.' The suffix 性, meaning 'nature' or 'property,' is then added to form a noun that denotes the quality of being addictive, thus '成瘾性' translates to 'addictiveness' or 'the property of causing addiction.'