Correct Answer: Idle

Solution : The correct choice is the third option .

Assiduous means showing great care, attention, and effort in one's work or duties. Its opposite, idle , refers to being inactive, lazy, or not engaged in any work or activity.

The meanings of the other options are as follows:

• Belligerent : This word refers to someone who is hostile, aggressive, or inclined to fight or engage in conflict.
• Meticulous : That describes someone who is extremely careful, precise, thorough and pays great attention to detail in their work or actions.
• Idyllic : It refers to something that is extremely peaceful, picturesque, or charmingly simple, often associated with a tranquil or idealised setting.