Nerv"ous (?), a. [L. nervosus sinewy, vigorous: cf. F. nerveux. See Nerve.] 1. possessing nerve; sinewy; strong; vigorous. "Nervous arms." Pope.

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.

Poor, weak, nervous creatures.

5. Sensitive; excitable; timid.

Our aristocratic class does not firmly protest against the unfair treatment of Irish Catholics, because it is nervous about the land.
M. Arnold.

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. Mayne.