American spelling; a person who states opinions as absolute truths or converts ideas into rigid, unquestionable doctrines.
From dogmatize + -er (agent noun suffix). The -er suffix for 'one who does' something is one of the oldest productive suffixes in English, dating to Old English.
Dogmatizers often don't realize they're being dogmatic—studies show that overconfidence in our own beliefs is actually correlated with having encountered less disagreement!
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