Focus on the pronunciation of invalid
English definition of “invalid”
› LAW not legally or officially acceptable: an invalid document/passport/licencebe declared/deemed/ruled invalid Insurance is ruled invalid if the report is not received within 30 days of the theft.
› not correct, or not based on correct information: A small number of messages bounced back from invalid e-mail accounts.
› IT not recognized or accepted by a computer: invalid data → Compare valid