When an illness wears you down and makes you ill, this is an example of a time when the illness debilitates.
transitive verb-·tat·ed, -·tat·ing
Origin of debilitatefrom Classical Latin debilitatus, past participle of debilitare, to weaken from debilis, weak, not strong from de- (see de-) + derived, derivative of Indo-European base an unverified form bel-, strong from source Classical Greek belteros, better
transitive verbde·bil·i·tat·ed, de·bil·i·tat·ing, de·bil·i·tates
Origin of debilitateLatin dēbilitāre dēbilitāt- from dēbilis weak ; see bel- in Indo-European roots.
(third-person singular simple present debilitates, present participle debilitating, simple past and past participle debilitated)
Latin debilitatus, past participle of debilitare (“to weaken, debilitate”), from the adjective debilis (“weak”), from de- + habilis (“able”).