infamous /ˈɪn.fə.məs/ adjective4 •Having a bad reputation; disreputable; notorious; unpleasant or evil; widely known, especially for something scornful.He was an infamous traitor.She is infamous for perjury. •Causing infamy; disgraceful.This infamous deed tarnishes all involved. •(UK, historical) Subject to a judicial punishment depriving (the person) of certain rights (e.g. the rights to hold public office, exercise the franchise, receive a public pension, serve on a jury, or give testimony in a court of law). •(no longer used) Punishable by death or imprisonment. formsmore infamous · most infamous