Learner's definition of AMATEUR
1 : a person who does something (such as a sport or hobby) for pleasure and not as a job 2 : a person who does something poorly : a person who is not skillful at a job or other activity
The people running that company are a bunch of amateurs.
Only amateurs make this kind of mistake.
He's a mere amateur when it comes to cooking. [=he doesn't know how to cook well]
— amateuradjective,always used before a noun