Unimpeachable, not able to be doubted, questioned, or criticized. Yo at some point want someone to go up to you and ask you for a favour and be trustworthy of you. Being unimpeachable is like being trustworthy, you must be full of integrity. Being unimpeachable is when you are loyal to someone. Unimpeachable is a gear trait to have because you want your friends and family to be trustworthy of you. I know I am unimpeachable when my parents leave me alone and they trust that I won't stay up all night or throw a party. Betty White is a really trustworthy celebrity. Everyone who works with Betty White has a tremendous amount of faith in her. She is probably one of the most trustworthy Hollywood stars. Betty white never forgets her lines and she is really humorous.