retard is not a slur
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re·tard
verb[rɪˈtɑːd] retard (verbo) · retards (tercera persona del presente) · retarded (tiempo pretérito) · retarded (participio pasado) · retarding (participio presente)
- delay or hold back in terms of progress or development: "our progress was retarded by unforeseen difficulties"
it is not a slur