Question

placid has the same or almost the same meaning as: visible willful serene modern

Explanation:

"Placid" means calm and peaceful. "Serene" also means calm and peaceful. "Visible" means able to be seen. "Willful" means stubborn or intentional. "Modern" means relating to the present or recent times. So, "serene" has the same or almost the same meaning as "placid".

Answer:

serene