Pronunciation: (in-fûrm'),[key] —adj. 1. feeble or weak in body or health, esp. because of age; ailing.
2. unsteadfast, faltering, or irresolute, as persons or the mind; vacillating: infirm of purpose. 3. not firm, solid, or strong: an infirm support. 4. unsound or invalid, as an argument or a property title.