Amateur. (Noun) A person inexperienced or unskilled in a particular activity; one lacking the skill of a professional.

Rihanna: I don't know who you think you are trying to pull off the dominatrix thing, but sweetheart, it ain't you. You may think you look sexy up there in your red and black leather and your knee-high boots, but missy, you are the textbook definition of an amateur. It's all in the eyes, honey, and all I see in yours is scared prom queen virgin on her way to the post-party at the Ramada Inn. Face it, lady: You're an amateur.You just go back to singing your silly little hippity-hop songs, and leave the dominatrixin' to the professionals.