| a constantly nervous, worried, or timid person. |

Nervous Nellie
An investor who isn't comfortable with investing and the risks associated with it.
Investopedia Commentary
If a nervous nellie ever does decide to invest, he or she is likely to liquidate the investment at any time.
See also: One Night Stand, Panic Selling, Risk
nervous Nellie
An unduly timid or anxious person, as in He's a real nervous Nellie, calling the doctor about every little symptom. This term does not allude to a particular person named Nellie; rather, the name was probably chosen for the sake of alliteration. [Colloquial; c. 1920]