Pathetic (noun) - when an individual has reached a point of such desperation and uselessness, and is found to encapsulate all that is the word 'pathetic', such an individual removes the need for the adjective, creating an object form. Eg: "She is a pathetic."
(Please note: this might not fly in matric English papers. AVOID! AVOID! It will, however, be very useful when needing to refer to an individual fitting the abovementioned criteria.)