Definition of -ness in English:

-ness

suffix

Forming nouns chiefly from adjectives:
1Denoting a state or condition: liveliness sadness
1.1An instance of a state or condition: a kindness
2Something in a certain state: wilderness

Origin

Old English -nes, -ness, of Germanic origin.

Definition of -ness in:

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Word of the day ween
Pronunciation: wiːn
verb
be of the opinion; think or suppose