Explanation:

- Edgy: This word often describes someone who is tense, nervous, or easily upset. It can also refer to something daring or unconventional.

- Option 1: Nervous: The correct synonym. Both words imply a state of being anxious or on edge.

- Option 2: Rational: This means being logical or reasonable, which is quite different from feeling edgy.

- Option 3: Calm: This represents a state of tranquility and composure, the opposite of edgy.

- Option 4: Illicit: This word refers to something illegal or forbidden, not directly related to being edgy.