Nervous

1. Possessing nerve; sinewy; strong; vigorous.
2. Possessing or manifesting vigor of mind; characterized by strength in sentiment or style; forcible; spirited; as, a nervous writer.
3. Of or pertaining to the nerves; seated in the nerves; as, nervous excitement; a nervous fever.
4. Having the nerves weak, diseased, or easily excited; subject to, or suffering from, undue excitement of the nerves; easily agitated or annoyed.
5. Sensitive; excitable; timid.
6. Apprehensive; as, a child nervous about his mother's reaction to his bad report card.
Nervous fever (Med.),
a low form of fever characterized by great disturbance of the nervous system, as evinced by delirium, or stupor, disordered sensibility, etc.
Nervous system (Anat.),
the specialized coördinating apparatus which endows animals with sensation and volition. In vertebrates it is often divided into three systems: the central, brain and spinal cord; the peripheral, cranial and spinal nerves; and the sympathetic. See Brain, Nerve, Spinal cord, under Spinal, and Sympathetic system, under Sympathetic, and Illust. in Appendix.
Nervous temperament ,
a condition of body characterized by a general predominance of mental manifestations.