Dogmatic (adjective)

1. Stating opinions or beliefs as if they are certainly true, without considering other possibilities.
2. Related to or characteristic of a dogma or dogmas.

Origin:

From late latin dogmaticus, from greek dogmatikos, from dogma "opinion, teaching", from dokein "seem".

Examples:

1. The speaker's dogmatic approach to politics left little room for debate.
2. He was criticized for his dogmatic refusal to consider alternative solutions.
3. The priest's dogmatic adherence to doctrine left little room for personal interpretation.
4. The dogmatic belief in the company's new product eventually led to its failure.
5. The dogmatic stance on certain social issues made it difficult for the politician to appeal to a diverse electorate.