Is it farther or further?
hypersensitive hy·per·sen·si·tive (hī'pər-sěn'sĭ-tĭv)
Responding excessively to the stimulus of a foreign agent, such as an allergen; abnormally sensitive.
An excessive or abnormal sensitivity to a substance. A person who is hypersensitive to a certain drug will often suffer a severe allergic reaction (see allergy) if given the drug.