As a Noun: 1. Someone who is learning how to do something, especially drive a vehicle. English = learner. 2. Someone who is not experienced at a job or activity they are doing. English = novice. Informal English = newbie, rookie. As a Verb or Adjective: 1. Of a person, to have very little experience at something, especially because you are young. Idiomatic English = (be) green.