What do you call this behavior of a person in one word? [closed]

A person is making negative comments and abusing others, but he is not at all explaining why or providing any reason for his comment, completely ignoring the questions.

What is the one word which perfectly defines his behavior?


Solution 1:

Imperious? Someone who is not explaining why or providing any reason for his actions could be seen as arrogant while being domineering and an absolute bully. Both bolded words are part of its definition.