• IPA: /ˈnaɪsnɪs/

niceness

1. (obsolete) Silliness; folly. [16th c.]
2. Effeminacy; indulgence in soft living or luxuriousness. [from 16th c.]
   • 1603, Michel de Montaigne, chapter 10, in John Florio, transl., The Essayes, […], book II, printed at London: By Val[entine] Simmes for Edward Blount […], OCLC 946730821 ↗:

     He was a good Citizen, of an honest-gentle nature, as are commonly fat and burly men; for so was he: But to speake truely of him, full of ambitious vanitie and remisse nicenesse {{transterm

3. (obsolete) Shyness; reserve. [16th-19th c.]
   • 1748, Samuel Richardson, Clarissa, Letter 63:

     Methinks a young create of niceness should be less ready to write to one man, when she is designed to be another's.

4. Fastidiousness; fine sensitivity. [from 17th c.]
5. Pleasantness, especially of behaviour or personality; agreeableness. [from 19th c.]
6. (computing, Unix) A value determining how much processor time to concede to a running process. (See also nice, renice.)