invalid
//ɪnˈvælɪd/, /ˈɪnvəlɪd//
Adjective
invalidCanonical form
1
Not legally or officially acceptable; null and void.
The contract was declared invalid because it lacked a signature.
2
Not based on truth or reason; false or incorrect.
His argument was invalid because it was based on false assumptions.
3
(of a person) Suffering from illness or disability; infirm.
She spent years caring for her invalid mother.
Synonym
Antonym
Noun
invalidSingular
invalidsPlural
1
A person who is chronically ill or disabled and requires care.
She devoted her life to caring for her invalid mother.
Synonym
Verb
1
To remove someone from active service due to illness or injury.
The soldier was invalided out of the army after being wounded in battle.