IPA: /dɪˈraɪsɪvnəs/
KK: /dɪˈraɪsɪvnɪs/
The quality or state of expressing contempt or ridicule towards someone or something.
His derisiveness made it difficult for others to take him seriously.
Derisiveness is formed from 'derisive' (from Latin 'derisivus', meaning mocking or scoffing) and the suffix '-ness' (meaning the state or quality of). The word describes the quality of being mocking or scornful.
Think of 'derisive' which means mocking, and remember that 'derisiveness' refers to the quality of being mocking or scornful.