invalid

Universal Words adjective, noun, verb adjective 1 not legally or officially acceptable: The treaty was declared invalid because it had not been ratified. * People with invalid papers are deported to another country. 2 not based on all the facts, and therefore not correct: an invalid argument 3 (computing) of a type that the computer cannot recognize: An error code will be displayed if any invalid information has been entered. * invalid characters OPPVALID noun a person who needs other people to take care of them, because of illness that they have had for a long time: She had been a delicate child and her parents had treated her as an invalid. * his invalid wife verb [VN] ~ sb (out)