nervousnellie
nounUK /ˈnɜːvəs ˈnɛli/
US /ˈnɜːrvəs ˈnɛli/
A nervous Nellie is someone who worries a lot about small things.
Don't be such a nervous Nellie—the roller coaster is totally safe!
OTHER MEANINGS
2. A person who panics easily in new or uncertain situations.
My brother is a nervous Nellie whenever we try a new restaurant.
3. Someone who is overly cautious and checks things again and again.
She's a nervous Nellie about locking the door three times before bed.
4. A character or person known for being easily frightened.
In the story, the nervous Nellie of the group refused to enter the dark cave.