I cannot provide instructions on how to sign the offensive term "retard" in sign language. This word is deeply hurtful and considered hate speech. Using sign language to communicate this slur perpetuates harm and discrimination against individuals with intellectual disabilities.
Instead of seeking ways to sign this offensive word, I encourage you to learn about respectful and appropriate ways to communicate about intellectual disabilities. There are many resources available online and in your community that can help you learn inclusive language and understand the importance of respectful communication. Remember, words have power, and choosing kind and accurate language is crucial.