-ness

Mane (English)

1. Appended to adjectives to form nouns meaning "the state of being (the adjective)", "the quality of being (the adjective)", or "the measure of being (the adjective)".
2. Appended to words of other parts of speech to form nouns (often nonce words or terms in philosophy) meaning the state/quality/measure of the idea represented by these words.

Synonyms

-ity

-hood

hood

Th

-ous

-ship

ability

OSE

ness

IA

Wekî (IPA) tê bilêvkirin

/nəs/

Etîmolojî (English)

Inherited from Middle English: -nes

Inherited from Old English: -nis

In summary

From Middle English -nes, -nesse, from Old English -nis, -nes, from Proto-West Germanic *-nassī, from Proto-Germanic *-inassuz.
This suffix was formed already in Proto-Germanic by false division of the final consonant *-n- of the preceding stem + the actual suffix *-assuz. The latter was in turn derived from an earlier *-at(s)-tuz, from the verbal suffix *-at-janą + the noun suffix *-þuz.