旺盛 (wàng shèng): vigorous; exuberant

Although this old banyan tree has grown for over a hundred years, its branches and leaves are still vigorous, and in summer it can still shade the whole street.

My grandpa is eighty, yet his appetite is still very vigorous; he can eat two bowls of rice at every meal.

This company's business is becoming more and more vigorous; this year it opened three more branches.

As soon as spring arrives, the weeds in the garden grow vigorously, even faster than the flowers that were planted.