enfermedad
/enfeɾmeˈdad/ · A2 · noun · f
illness
🤒 enfermedad = enfermo (sick) + -dad (-ity): literally sick-ity
From Latin infirmitas, the same root as English infirmity and infirmary: in- (not) + firmus (firm, strong). So an enfermedad is a state of being not firm. The ending -dad matches English -ity, as in ciudad/city.