1.
An ~ is someone who needs to be cared for because they have an illness or disability.
I hate being treated as an ~.
N-COUNT
2.
If an action, procedure, or document is ~, it cannot be accepted, because it breaks the law or some official rule.
The trial was stopped and the results declared ~...
ADJ
3.
An ~ argument or conclusion is wrong because it is based on a mistake.
We think that those arguments are rendered ~ by the hard facts on the ground.
ADJ