Choose the option opposite in meaning to the underlined word(s).
Everyone, including the Principal, believed that he was very assiduous student?
The correct answer is: D
Explanation
"Assiduous" means showing great care, attention, and effort in one's work or duties. In this context, it describes someone who is diligent and hardworking. On the other hand, "casual" means relaxed, informal, or not taking something seriously. So, if everyone believed the student was very assiduous, the opposite would be that they believed he was not casual or not taking his responsibilities lightly.