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English word fucktard comes from English retard, English freaking
retard (English)
(music) A slowing down of the tempo; a ritardando.. (slang, offensive) A stupid person, or one who is slow to learn.. (slang, offensive, dated) A person with mental retardation.. Retardation; delay. (intransitive) To decelerate; to slow down.. (intransitive, obsolete) To stay back.. (transitive) To keep delaying; to continue to hinder; to prevent from progress. (transitive) To put off; to [...]
freaking (English)
(dated) A streak or variegation in a pattern. (minced oath, slang, vulgar, chiefly, US) Fucking.. (obsolete) freakish (euphemistic, vulgar, slang, US) Fucking.
fucktard (English)
(pejorative, slang, vulgar) An extraordinarily stupid person, especially one who causes harm.