IPA: //aɪˈreɪtnəs//
KK: /aɪˈreɪtnɪs/
The condition of being very angry or upset.
His irateness was evident when he heard the news.
Irateness → It is formed from "ira" (from Latin, meaning anger) and the suffix "-ness" (meaning the state or quality of). The word "irateness" refers to the state of being angry.
Think of 'ira' which means anger, and remember that 'irateness' describes the quality of being in a state of anger.