Invalid may refer to:
People Patient, a sick person An invalid, one confined to home or bed because of disability or injury
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
Other uses .invalid, a top-level Internet domain not intended for real use Invalid (film), a 2023 Slovak black comedy movie
See also
Void (disambiguation)