Nervous Nellie is a term used to describe someone who is overly anxious and easily scared. This person can also be referred to as a WORRYWART, fidgeter, or fraidycat. A WORRYWART is someone who worries excessively about things that may or may not happen. A fidgeter is someone who fidgets or moves around constantly due to nervousness or anxiety. Lastly, a fraidycat is someone who is easily scared or intimidated.