Dogmatic – asserting principles or opinions as being undeniably true
"I should get a dog automatically (dogmatic) at Christmas" cried the young boy, asserting his opinion as being undeniably true.
Examples of dogmatic in a sentence
I may sound dogmatic, but I am certain I am right!
The president was slammed as dogmatic as he refused to listen to others' opinions.
The dogmatic boy always had to have the last word.