He is adamant on going.

Here is a more detailed explanation of each option:

• Confused: The person is refusing to change their mind about going, even though others may be trying to convince them otherwise. This suggests that they are confused or unsure about what they want to do.
• Lenient: The person is not willing to give in or make an exception. This suggests that they are not lenient.
• Stressing: The person is not feeling anxious or worried. This suggests that they are not stressing.
• Yielding: The person is not giving up or backing down. This suggests that they are not yielding.