Meaning

• A lover of something.

• A person attached to a particular pursuit, study, or science as to music or painting; especially one who cultivates any study or art, from taste or attachment, without pursuing it professionally.

  "The contest is only open to amateurs."

• Someone who is unqualified or insufficiently skillful.

  "The entire thing was built by some amateurs with screwdrivers and plywood."

Meaning

• Non-professional.

• Created, done, or populated by amateurs or non-professionals.

  "amateur sports"

• Showing a lack of professionalism, experience or talent.

  "Duct tape is a sure sign of amateur workmanship."