The crossword solution for the term 'Writer Loos' is ANITA. ANITA Loos was an American screenwriter, playwright and author, best known for her blockbuster novel Gentlemen Prefer Blondes. She wrote over twenty-five plays and musicals, many of which were adapted into films. She was also a prolific writer of short stories and essays, and was one of the first female writers to be taken seriously in Hollywood.