Invalid

Invalid may refer to: Patient, a sick person one who is confined to home or bed because of illness, disability or injury (sometimes considered a politically incorrect term) Invalid (film), a 2023 Slovak black comedy movie .invalid, a top-level Internet domain not intended for real use

As the opposite of valid: Validity (logic), in logic, true premises cannot lead to a false conclusion Validity (statistics), a measure which is measuring what it is supposed to measure