Another word for it is “blunt”, defined by New Oxford American as “uncompromisingly forthright (of a person or remark)”.
My honest, true-to-himself, senior friend can sometimes offend sensitive people unfamiliar with his loving, generous nature. Lacking some social skills and political correctness, he does not aim for brevity or diplomacy in conversation with friends, family, or strangers. He often comes across as blunt. However, he is naturally quick to help people and sacrifice himself in service to others.
What can I say?
