incapable

adjective

• 1 (incapable of) unable to do or achieve (something):Wilson blushed and was incapable of speech
• not allowing the possibility of (a particular action):with the battery removed, the car was incapable of being driven
• (of a person) too caring or moral to do (something):a man incapable of any kind of prejudice

• 2unable to behave rationally or manage one’s affairs; incompetent:the pilot may become incapable from the lack of oxygen