陡峭 (dǒu qiào): หนาแน่น

This mountain path is very steep; tourists must hold onto the iron chains to slowly climb up.

We climbed the steep stairs to the top of the tower, from where we could see the whole city.

That mountain is extremely steep, with almost no flat areas, so very few people can climb to the top.

Because the mountain road was steep, the driver drove very slowly, carefully turning each bend.