Noun
a person who has some condition that markedly restricts their ability to function physically or mentally or socially
Source: WordNetAn illiterate person is like a handicapped person who is unfamiliar with the happenings in his surroundings, cannot even competently do own basic day to day activities; remain unaware of their rights and duties towards the society. Source: Internet
One of the more dangerous assumptions from the comments last week, was that as no mentally handicapped person (as defined by whom?) is capable of consent, any sexual encounter is in fact rape. Source: Internet