0 An invalid document, ticket, law, etc. is not legally or officially acceptable: --
1 someone who is sick and unable to take care of himself or herself, especially for a long time: --
Is the invalid in bed?
2 not true or acceptable, or not correctly thought out: --
3 a person who is ill or injured for a long time and usually has to be cared for by others: --
4 not legally or officially acceptable: --
5 not correct, or not based on correct information: --