The phrase "dost right" is an old English term that was commonly used to indicate someone was behaving properly or doing what is considered acceptable in a given situation. Some antonyms to the word "dost right" would include words such as "misbehave," "deviate," "violate," "transgress," and "err." When someone "misbehaves," they are not doing what is considered "dost right." When someone "deviates," they are moving off of the path of what is acceptable behavior. Similarly, when someone "violates" or "transgresses," they are breaking rules or laws. Finally, someone who "errs" is making a mistake or doing something wrong.