Antonyms for the phrase "lowdown dirty" include noble, upright, ethical and honest. A person or thing which is noble is considered to be possessing high qualities of character or virtue, and acts in a manner which is morally good. Upright suggests an individual or entity that adheres firmly to principles and possesses integrity, often contrasted with someone who is corrupt or deceitful. Ethical is related to the accepted principles of right and wrong that govern conduct, and is often associated with individuals who demonstrate high moral standards. Finally, honest is an adjective that is in contrast with lowdown dirty and suggests the absence of deceit or falsehood.