invalid
adjectiveUK /ɪnˈvælɪd/
US /ɪnˈvælɪd/
Not allowed or not working the right way.
Your ticket is invalid, so you cannot get on the bus.
RELATED WORDS
OTHER MEANINGS
2. A person who is very sick or hurt and needs care.
The nurse helped the invalid in the wheelchair.
3. Not based on facts or good reasoning.
His argument was invalid because the numbers were wrong.
4. Not legally or officially acceptable.
The contract became invalid after the deadline passed.