IPA: //dɔɡˈmætɪkəl.nəs//
KK: /dɔɡˈmætɪkəlnəs/
The quality of being very certain about something, often without considering other opinions or ideas.
His dogmaticalness made it difficult for others to share their views during the discussion.
Dogmaticalness → It is formed from "dogma" (from Greek "dogma", meaning opinion or belief) and the suffix "-ical" (meaning pertaining to) and "-ness" (meaning the state of being). The word refers to the state of being pertaining to a dogma or a set of beliefs.
Think of 'dogma' as a strong belief or opinion, and remember that 'dogmaticalness' describes the state of being strongly opinionated about those beliefs.