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. Sensitive; excitable; timid.
4. Having the nerves weak, diseased, or easily excited; subject to, or suffering from, undue excitement of the nerves; easily agitated or annoyed.