What is the word "deep" in ancient poetry?

How deep is the courtyard —— Ouyang Xiu's love affair with butterflies

bears, dragons, tempestuous on mountain and river, startle the forest and make the heights tremble —— Li Bai, tianmu Mountain Ascended in a Dream

see how these nine horses all vie with one another, the high clear glance, the deep firm breath —— Du Fu, a Drawing of a Horse by General Cao At Secretary Wei Feng's House

it is certain that to enter through the deepness of the mountain, Qingxi's several trips to Yunlin —— Wang Wei's trip to Taoyuan

cicadas singing in the west land, and the guests in the south crown thinking deeply ——— Luo Bin Wang a political prisoner listening to a cicada

The winding path is clear. Of boughs and flowers, to a Buddhist retreat —— Chang Jian's Temple of the Broken Mountain

though a country be sundered, hills and rivers endure, and spring comes green again to trees and grasses —— Du Fu's longing for spring

through ancient woods without a human track, but now on the height I hear a bell —— Wang Wei's crossing xiangji temple

where a fisher-boat dips by a waterfall, ancient, modern, to and fro —— Meng Haoran and other scholars climbed Xian Mountain

Haimen was nowhere to be seen, and Pu Shu was far from nourishing ——— Wei Yingwu was endowed with dusk rain to send Li Zhou < Romantic and refined, he too is my teacher —— Du Fu's memory of historic sites (II)

too softly for anyone to hear, except my comrade, the bright moon —— Wang Wei's Zhuli Hall

though you think to return to this maze of mountains, oh, let them brim your heart with wonder! —— Pei Di sent Cui Jiu

how beautiful she looks, opening the pearly casement, and sat deeply in the beauty —— Li Bai's resentment

a thousand miles from her home, and 2 years in the palace —— Zhang Hu He Manzi

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