retard

verb
  1. To delay or hold back in terms of progress, development, or accomplishment. verb
    The heavy traffic will retard our journey to the city.
    The new regulations are likely to retard economic growth.
  2. A person who has a mental disability (considered offensive and outdated). noun
    The term 'retard' is now considered derogatory and should be avoided.
    Using 'retard' as an insult is disrespectful and harmful.