SUFFIX
(用于形容词后构成名词)表示“状态”，“性质”
-ness is added to adjectives to form nouns which often refer to a state or quality. For example, 'sadness' is the state of being sad and 'kindness' is the quality of being kind.
例句
'This is not good,' he said with great seriousness.
他特别严肃地说：“这可不好。”