green as grass

*green as grass

very green. (*Also: as ∼.) His face turned as green as grass just before he vomited.
See also: grass, green

green as grass

BRITISH
If someone is as green as grass, they have little experience or knowledge of something and trust what other people tell them too easily. I was a newcomer to the sport and as green as grass. Note: It is much more common just to say that someone is green. They admit they were very green when they arrived.
See also: grass, green