invalid (in-val-id), adj.
1. Not legally binding (an invalid contract).
2. Without basis in fact (invalid allegations).
invalid (in-v[schwa]-lid), n. A person who, because of serious illness or other disability, lacks the physical or mental capability of managing his or her day-to-day life. [Cases: Guardian and Ward 9.5; Mental Health
3. C.J.S. Insane Persons§§ 2, 6.]