-ness
/nɪs/forming nouns chiefly from adjectives ［主要由形容词构成名词］：
suffix
1
- denoting a state or condition表示“性质”, “状态”：
liveliness
sadness.
1.1
- an instance of this表示“某一种状态（或性质）”：
a kindness.
2
- something in a certain state表示“处于特定状态的某物”：
wilderness.
词源
Old English -nes, -ness, of Germanic origin.