If you say that someone is plain-spoken, you mean that they say exactly what they think, even when they know that what they say may not please other people.
2. characterized by directness in manner or speech; without subtlety or evasion;
"blunt talking and straight shooting""a blunt New England farmer""I gave them my candid opinion""forthright criticism""a forthright approach to the problem""tell me what you think--and you may just as well be frank""it is possible to be outspoken without being rude""plainspoken and to the point""a point-blank accusation"