Dogmatic means insisting on beliefs without allowing question. A dogmatic teacher, dogmatic certainty, dogmatic about it.
It is always a criticism, and the charge is about the manner rather than the belief — you can be dogmatic about something true. Being dogmatic is holding a position in a way that no evidence could shift. Note dogma; and that the Greek word behind it once meant simply didactic.
1adjectivedogmaticInsisting on beliefs without allowing question.
“He's so dogmatic about diet that he won't even listen to his own doctor.”
synonyms: doctrinaire, opinionated
dogmatic is a quality of rigid belief.
Greek dogmatikos comes from dogma, an opinion, from dokein, to seem good. Doctrine comes from a related root.
Ancient Greek
δογματικός — didactic
Latin
dogmaticus
Middle French
dogmatique
English, today
dogmatic
Built from
From Middle French dogmatique and its etymon, Latin dogmaticus, from Hellenistic Ancient Greek δογματικός (“didactic”), from δόγμα (“dogma”).
Etymology from Wiktionary, CC BY-SA