dogmatist:
(plural: ‘dogmatists‘; pronunciation: the letters ‘dog’ rhyme with the word “dog”)
a person who puts forward (expresses) ideas, opinions, beliefs without proof and expects others to accept them without questioning or reasoning,

Margaret Thatcher, former Prime Minister of England, was viewed by some people in political circles as a ‘dogmatist’
A person who is not shaken by any opposing evidence to his/her belief is called a pragmatist, and such a pragmatist tries to win over any argument by just adhering to his/her beliefs at all times.
Some dogmatists believe that keeping old people in ‘old age Homes’ is inhuman.
Some experts believe that researchers like Einstein, Humphry Davy, Dr Joseph Priestly had suffered the reputation of being dogmatists of their time; however, the same experts accept the fact that a dogmatist is often regarded with respect when his/her stubbornness does some good for the mankind!
