In English it also means a sick person or someone who is not well
Really? Because the meaning of ''invalid'' is something false and it's my first time seeing this and I know English for over 15 years. So is it something new or?
noun
an infirm or sickly person.
a person who is too sick or weak to care for himself or herself:
can also be the definition you used too English is a weird language it has to many meanings at times for the same word. and if you get into american english we are even more f'd up lol, especially if you learned british (proper) english lol. had a german friend who came here on exchange for school and asked the teacher for a rubber.. ya
The adjective and noun are pronounced differently, too. Two different words
I was so confused to see the word invalid here, because in my language it does mean a person with disability.