Not valid; not true, correct, acceptable or appropriate.
Suffering from disability or illness.
Intended for use by an invalid.
To make invalid or affect with disease.
To exempt from (often military) duty because of injury or ill health.
Seemingly well-reasoned, plausible or true, but actually fallacious.
Employing fallacious but deceptively plausible arguments; deceitful.
Having an attractive appearance intended to generate a favorable response; deceptively attractive.